Company Information

Keystone Co., Ltd. 

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A Pioneer in Rope Access Technology – Unmatched Expertise and Proven Reliability

Guaranteed satisfaction and complete peace of mind— This is the trusted “Keystone Brand.”

Keystone Co., Ltd. is Japan’s leading rope access specialist company, founded in 1991 by Toyoharu Nakatani, who left his corporate career to start the business.

We excel in inspections, surveys, and construction work in high or hard-to-reach areas, offering safe, fast, and reliable solutions to aging infrastructure problems across Japan.

Recognized as a truly exceptional presence in the rope access industry, we pride ourselves on our unmatched technical capabilities and expertise. We have maintained a perfect safety record with zero accidents for over 35 years since our founding.

Our team consists entirely of full-time, certified technicians based in Kyoto and operating nationwide.

Clients consistently praise our work as “skilled, fast, and cost-effective,” with many expressing deep satisfaction and admiration for the results we deliver.

Corporate Philosophy

Customer-Centric Approach

We strive to accurately respond to what our customers truly desire.

3 Core Business Principles

1 Never Say No to a Job

No matter how difficult the site may be, we propose the best solutions with flexible thinking and reliable skills.
If you feel a task might be “impossible,” please consult us first.

2 Work Within Your Budget

We provide proposals that align with your budget.
Together, we find ways to reduce costs without compromising on quality.

3 Delivering Satisfaction, Emotion, and Delight

We aim not only for successful execution, but for results that truly satisfy our clients.
Hearing our customers say, “I’m glad I chose you,” is our greatest reward.

Company Overview

Company Name
Keystone Co., Ltd.
President & CEO
Toyoharu Nakatani
Established
1991
(Heisei 3)
Head Office
6-1 Kotobukisaki, Kanegahara, Nagaokakyo City, Kyoto 617-0856, Japan

TEL

075-959-9095

FAX

075-959-9096

E-Mail

keystone@rope-access.co.jp


Keystone Gojō

Large-scale training tower, training and accommodation facility
4-2-57 Imai, Gojō City, Nara 637-0004, Japan

Kyushu Branch

3-27-25 Hakataekimae, Hakata-ku,
Fukuoka City, Fukuoka 812-0011, Japan
TEL: +81-92-686-8022

Tokyo Office

PCP Marunouchi, 1-11-1 Marunouchi,
Chiyoda-ku, Tokyo 100-6213, Japan
TEL: +81-3-6775-3643

Sapporo Office

4-1-7 Kita 4-jo Nishi, Chuo-ku,
Sapporo City, Hokkaido 060-0004, Japan
TEL: +81-11-804-8641

Construction Business License

Licensed by Kyoto Governor
(Special-6) No. 44402
Fields: Civil Engineering / Scaffolding & Earthwork / Pavement / Painting / Steel Structures / Dredging / Waterworks / Masonry

Base of Operations: Kyoto

Keystone Gojō

Kyushu Branch
Tokyo Office
Sapporo Office

Group Companies

Keystone Holdings Co., Ltd.

6-1 Kotobukisaki, Kanegahara, Nagaokakyo City, Kyoto 617-0856

6-1 Kotobukisaki, Kanegahara, Nagaokakyo City, Kyoto 617-0856

Keystone Kyushu Co., Ltd.

3-27-25 Hakataekimae, Hakata-ku, Fukuoka City, Fukuoka 812-0011

1-8, Heiwa 1-jo 6-chome, Nishi-ku, Sapporo, Hokkaido 063-0021

Tsujimoto Drone Service Co., Ltd.

6-1 Kotobukisaki, Kanegahara, Nagaokakyo City, Kyoto617-0856

6-1 Kotobukisaki, Kanegahara, Nagaokakyo City, Kyoto 617-0856

5-4-16 Toge, Hashimoto City, Wakayama 648-0072
NY Work Co., Ltd.
1-3-21 Imai, Gojo City, Nara
637-0004
Tateishi Facilities
174-12 Arakicho, Matsusaka City, Mie
515-0007
Ototama Farm Co., Ltd.

4-2-57 Imai, Gojo City, Nara
637-0004

Chishitsu Shigoto Co., Ltd.

4-2-57 Imai, Gojo City, Nara
637-0004

Key Staff Members

President & CEO
Toyoharu Nakatani

Born in Nara (Dec. 1956) / Resident of NaraStudied geology at Osaka City University (PhD program, withdrawn).Worked in in-house consulting at Tobishima Corporation’s Technology Research Institute on tunnels, dams, and land development.After leaving the corporate world, founded Keystone Co., Ltd. and began rope access inspection services.

Chief Technical Officer / Director
Daisuke Yamaguchi
Graduated from Kindai University, former employee of Marine Bridge Foundation.Oldest member, born in the Year of the Tiger.Certified Road Bridge Inspector, Rope Access Technician[SORAT] Level 4 [PRO] / [Cliff & Slope] Level 3 / [Bridge & Structure] Level 4
Director / Head of Technical Department
Hosugi
Graduate of Kyoto Institute of Technology (Engineering, Master’s)Former American football head coach. From Shiso City, Hyogo (formerly Haga Town).Certified Road Bridge Inspector, Magnetic Particle Testing Level 1, Rope Access Technician[SORAT] Level 4 [PRO], Cliff inspection expert
Director / General Affairs Manager
Saito
Withdrew from doctoral program at Otani University. From Sanjo City, Niigata.Handsome monk, Land Cruiser lover.Certified Road Bridge Inspector, Rope Access Technician [SORAT] Level 4 [PRO]
Director / Chief IT Officer
Tsujimoto
Mood maker “Tsujimo-chan”, IT head, shares physique and looks with the CEO.Loving wife and daughter.Certified Road Bridge Inspector, Rope Access Technician [SORAT] Level 3 [PRO]
Director / Accounting Manager
Yokota
Architecture graduate of Nara Women’s University.Joined as a part-timer.Reliable senior, from Nara.
Executive Director
Keita Nakatani
Graduate of Ritsumeikan University, Information Engineering.Joined after working for an IT company in Tokyo.Rope Access Technician [SORAT] Level 3 [PRO]
Technical Sales Manager

Tomokiyo

From Nara, graduate of Setsunan University (Architecture).Professional remodeler and singer, popular among housewives.Certified Road Bridge Inspector, Rope Access Technician [SORAT] Level 4 [PRO]
General Leader

Jodai

Graduate of Kobe International University.Powerhouse athlete with extraordinary strength who defies rope access norms.Expert in rope rescue. Former firefighter, fitness enthusiast, loves hamsters, rabbits, and sweets.Licensed in large vehicles, aerial work, special radio, hazardous materials, emergency care.Certified Road Bridge Inspector, Rope Access Technician [SORAT] Level 5 [PRO]

General Leader

Tanaka

Graduate of Bukkyo University (Science & Engineering). From Uji, Kyoto.Nature guide and instructor, gymnastics background.Rope Access Technician [SORAT] Level 4 [PRO]

Team Leader
Kumamoto
Bodybuilding enthusiast. From Fukuoka.Graduate of Kindai University, Faculty of Science and Engineering, Protein Studies Major.Certified Road Bridge Inspector, Magnetic Particle Testing Level 1, Rope Access Technician [SORAT] Level 4 [PRO]
Team Leader
Watanabe
Artist who talks to and nurtures stones, mysterious meat-loving woman.From Fukuoka, M.F.A. in Sculpture from Kyoto City University of Arts.Rope Access Technician [SORAT] Level 4 [PRO]
Team Leader
Ogawa
Right-brained genius with countless legendary feats.Bonjour-P, half French raised in southern France and Akita.Certified Road Bridge Inspector, Rope Access Technician [SORAT] Level 5 [PRO]
Team Leader

Kiribayashi

“Marron,” strongest female rope user who also conquers cliffs.Curious nature-loving agricultural girl.Rope Access Technician [SORAT] Level 4 [PRO]
Team Leader
Ozer
From Turkey, studied economics at University of Bern in Switzerland (German).17 years in Japan, patriotic Muslim with Japanese wife and two daughters.Rope Access Technician [SORAT] Level 4 [PRO]
Team Leader
Sudoh

From Kanagawa, lovely mom, sometimes cute.Piano tuner & wall climber, trains fingers, eats weeds, mountain girl with strong legs, vegetable sommelier.Rope Access Technician [SORAT] Level 4 [PRO]

Team Leader
Tsuji
Graduate of Ryukoku University, Information Media. Assistant IT Manager.Former “Ero Baron,” now a dad.IT certification level 1.Rope Access Technician [SORAT] Level 3 [PRO]
Team Leader
Gotoh
From Yamatokoriyama, Nara. Graduate of Ryukoku University. Former construction consultant.Head of the goldfish club at high school. Interested in cacti, hunting, organic farming, and martial arts.Certified Road Bridge Inspector, Rope Access Technician [SORAT] Level 3 [PRO]
Team Leader
Lull
From Paris, France. Dislikes IRATA, globetrotting rope technician.Married to a Japanese wife, new dad, skydiver.Rope Access Technician [SORAT] Level 2
Technical Staff
Nakai
From Minoh, Osaka. Mid-distance runner, former track & field.Graduate of Biwako Seikei Sport College. Dislikes watching sports.Rope Access Technician [SORAT] Level 3 [PRO]
Technical Staff
Shibata
From Himeji, graduate of Hiroshima Institute of Technology (Engineering).Rope Access Technician [SORAT] Level 3 [PRO]
Technical Staff
Ishida
From Iwakuni, Yamaguchi.Rope Access Technician [SORAT] Level 2
Technical Staff
Sumi
From Kurume, Fukuoka. Talks to fairies and chickens.Outsider-style artist like Ebisu-san and Rousseau.Geology graduate, Fukuoka University.Rope Access Technician [SORAT] Level 2
Technical Staff
Tahashi
From Okinawa, graduate of Okinawa International University.Rope Access Technician [SORAT] Level 2
Technical Staff
Satoh
Rope Access Technician [SORAT] Level 2
Technical Staff
Yabe
Rope Access Technician [SORAT] Level 2
Technical Staff
Kondoh
From Yamashina, Kyoto. Graduate of Otani University (Education), former baseball team member.Rope Access Technician [SORAT] Level 2
Technical Staff
Kuga
Rope Access Technician [SORAT] Level 2
Technical Staff
Yamauchi

From Mineyama High School, Kyotango City, Kyoto. Former Formula race car driver.

Technical Staff
Uno
From Gojou City, Nara. Oldest member, born in 1956. Aspiring to revive the noble Uno family.
Technical Staff
Fujii
Roots in Amami. Born and lives in Osaka. Holds many practical certifications useful on-site. Devoted to his children and loving husband. Big game fishing, anime, horse racing.
Technical Staff
Kawai
Aims to become an international mountain guide at the International College of Nature and Adventure Studies, Mountain Professional Department. From Ina City. 22-year-old new graduate, good at mountain climbing, climbing, Monster Hunter, and volleyball. Not good with injections… and the kind of water like oceans or lakes where the bottom can’t be seen. Living alone, says “I try to cook for myself.”
Technical Staff
Okuno
From Wakayama City. Class-2 Civil Engineering Works Management Technician. Experience as site supervisor at a paving company. Looks like he’s in his 40s, but still in his 20s. Doesn’t suit a suit. True ability is unknown, but persistent and well-integrated into Keystone. Master of sea fishing. Lives in company dormitory.
Technical Staff
Soichiro Ogawa
Joined after graduating high school ★ The youngest but already showing leadership potential. Surprisingly lives in a luxury high-rise apartment in central Osaka. Planning to live alone for the first time. Might also be good at IT. Likes nature, games, and scuba diving. Dislikes parsley and mint chocolate. “I want to be more honest with my feelings!”
Technical Staff
Pich Boonyasarn

Born in 1988 in the Kingdom of Thailand. Graduated in civil engineering from Chiang Mai University. Completed graduate studies in civil engineering at University of Technology Sydney (Australia). IRATA Level 2. Experienced in rope access work in Thailand, Cambodia, Australia, etc. Fluent in Japanese and English. Loving husband. Big anime fan. “Pich is on the move!”

Technical Staff
Jose Luis Pereyra Recalde
From Argentina. Studied geotechnical engineering in New Zealand. Holds IRATA Level 1. Experienced in rope access work in various countries. Speaks English, Spanish, and Japanese. Loves Japan!! Loves Japanese nature. Enjoys mountains, the sea, train travel without a set destination. Likes playing and watching soccer. Photography, video editing, computers. Dislikes long lines and how long movies only give about a 15-minute break in the middle. “Live without anger. Let’s enjoy life with a positive attitude.”
Technical Staff
Odake
Born in 1996, from Hofu City, Yamaguchi Prefecture. Lives in Osaka City with family. Holds many qualifications including First-Class Electrician. Skilled and experienced in on-site work. Likes camping and strength training. Basketball and electrical work. Dislikes bitter melon. “Once I start something, I want to finish it to the end.”
Technical Staff
Takigami
A Kansai native born and living in Osaka. Basketball and baseball. Calm and gentle appearance, but a spirited woman with endless competitiveness. Enjoys reading and theater. Witnessed Keystone’s rope access bridge inspection in high school and was amazed. Found it again online and joined the company. “There is only one truth.” Has great potential.
Technical Staff
Hosokawa

Graduate of Fukuoka University of Education, with junior and senior high school teaching licenses (Health and PE). Born in Tanzania, Bolivia, and Shizuoka. Licensed Second-Class Electrician. Speaks English, Spanish, and Japanese. Enjoys mountain climbing and basketball. Likes peaceful places and nature. “If there’s something I want to do, I’ll try it!” Dislikes crowds and the black part at the end of turban shells. Born in 1988, single, lives in company dormitory.

Frequently Asked Questions

Q: What is the origin of the name “Keystone”?
A: It is derived from the Japanese word “Kaname-ishi” (keystone), which is said to hold back earthquakes. It reflects our desire to be a reliable presence.

Q: Isn’t this a dangerous job? Is insurance in place?
A: Yes, we have full insurance coverage just like any other profession. Additionally, we have maintained a zero-accident record for 33 years since our founding.

Q: Do you have your own rope technology?
A: Yes. Based on caving techniques, we have developed original methods tailored to the needs of Japanese industries.

Q: Do you have rival companies?
A: Not directly. While some companies have partially adopted our techniques, we are often referred to as “in a league of our own.”

Q: Are your staff rock climbers?
A: No, most of them come from ordinary backgrounds. All our members are certified and experienced as professional technicians.