Company profile

Let us tell you about KOJIMAGUMI.

We aim to improve our work efficiency through untiring efforts to develop self-technology, show appreciation to shareholders for their support and protect our employees' living, contributing to society.

 Since our establishment in 1919, we have been accumulating results in many constructions including dredging, reclamation, marine civil engineering, etc. as a company that owns highly specialized unique vessels. People used to have not-so-positive image on dredging and reclamation, regarding them as a cause of negative influence on environment. The essence of KOJIMAGUMI's business lies in bringing a harmony among land, environment and human living in nature. We respond to wide range of social demands from a small river dredging to a large port development by fully utilizing our highly efficient and energy saving diverse vessels such as the world largest grab dredger GOSHO and others. Lately our dredging technology has been sought globally. We are going to send our best employees to the world and proceed to our further expansion to the South East Asia in medium-term and to Africa and India in long-tem. What I care the most in the relationship with the client in the world are "an operation with integrity" and "a relationship of trust". Assuming the solid technology, building up totally open relationship revealing all the good and the bad will lead us to the solution in a real sense. That is what I believe. As the developing countries' economy improves rapidly, our job in various project including port development is expected to gain more importance in the future. KOJIMAGUMI is a civil engineering company, and at the same time "a construction machinery maker" who constantly proposes a new technology. We contribute to the society by developing a unique vessel with our own idea that can't be found anywhere in the world and utilizing it in civil engineering. We, all the employees and executives, continue making an effort in one mind to be able to gain the recognition as "the company with the best dredging technology in the world" with our untiring spirit for developing technology in near future.

President, Representative Director
Tokuaki Kojima

Company KOJIMAGUMI Co., Ltd. Capital 90,000,000 JPY
Head office 〒455-0021
1-6 Kiba-cho, Minato-ku,
Nagoya, Aichi, Japan 455-0021 
TEL: +81 52 691 7040
Settlement May annually
Established Jun, 1919 Representative President, Representative Director 
Tokuaki Kojima
Reorganized Dec. 1941 Number of
160 (As of May, 2017)
Business Dredging/reclamation, civil engineering works and related activities Constructor
Register No.
Licence obtained by Minister of the Ministry of Land, Infrastructure, Transport and Tourism (Special)26-3337
Work type
Civil engineering/scaffolding

1919 Jun. Establish in Ueno-village, Chita-county, Aichi (Current Nawa-machi, Tokai-city)
1941 Dec. Reorganize (Capital 198,000 yen)
1948 Apr. Start dredging 
(Horikawa river dredging)
1954 Mar. Build a wooden grab dredger 
1957 Sep. Move office to current location
1959 Mar. Build a steel grab dredger
1963 Mar. Increase the capital to 18,000,000 yen
1967 Apr. Open Tokyo branch
1970 Jun. Build an anchorless grab dredger 
1975 Mar. Patent anchorless moving equipment 
(2 Spuds)
Nov. Increase the capital to 36,000,000 yen
1984 Jul. Open Osaka branch
1985 Sep. Build a hydraulic counter weight balance system grab dredger 
1988 May. Increase the capital to 80,800,000 yen
1993 Jul. Build an air pressure transfer vessel (Air pressure vessel) 
1995 Jul. Build a mega grab dredger 
(200m3 Grab bucket) TOSHO
2000 May. Build a second mega grab dredger (200m3 Grab bucket) GOSHO
2004 Aug. GOSHO & TOSHO complete Nakayama channel dredging
2008 Oct. First overseas dredging project in Saudi Arabia (GOSHO)
2012 Apr. First African dredging project in Republic of South Africa (TOSHO)
Sep. Increase the capital to 90,000,000 yen
2014 Jun. First South East Asian dredging project in Singapore (661 RYOSEI MARU)

Tokyo branch

Tokyo branch
Hacchobori Chishima Bldg. 6F, 3-22-11Hacchobori, Chuo-ku, Tokyo 104-0032
TEL +81 3 3297 1681

Osaka branch

Osaka branch
Sando Bldg. 2F, 1-24-5, Himesato, Yodogawa-ku, Osaka 555-0025
TEL +81 6 6477 1161

Yokohama service office

Yokohama Bldg., 3-9 Kaigandori, Naka-ku, Yokohama, Kanagawa 231-0002
TEL+81 45 201 7016

Ibaraki service office

Fujihiro Bldg., 217-2 Kyuchu, Kashima, Ibaraki 314-0031
TEL +81 299 83 8799

Chita service office

8 Suzaki, Nawa-machi, Tokai, Aichi 476-0002
TEL +81 52 601 0169

Tokoname service office

1-95 Shinkai-cho, Tokoname, Aichi 479-0837
TEL +81 569 34 9793

Ama servise office

1-16 Kusunoki, Yatomi, Aichi 498-0066
TEL +81 567 68 4100

Kyushu service office

Voice Hakata Bldg. 508, 1-7-14 Hakataeki-minami, Hakata-ku, Fukuoka, Fukuoka 812-0016
TEL +81 92 477 7005

Our founder Ryoichi Kojima once served as a chairman for Ueno (current Tokai-city) town assembly. And the letter "Ryo" from his first name was branded on shovel and other civil engineering work equipments. That is said to be the origin of this logo. Then after being demobilized from the WW2, the third president Akio Kojima (deceased) improved the design by adding the symbol color blue as in the beautiful ocean that surrounds Japan. Heishu Hosoi (born in current Tokai-city), who was a mentor of Yozan Uesugi, Yonezawa's (Yamagata prefecture) lord of feudal clan and a renowned Confucian scholar in Edo era, being greatly respected at his birth town, said "All of learning, thinking and acting together complete the good." That also expresses the core philosophy of our company, which is aiming to contribute to the society through learning on site, thinking and acting.

President, Representative Director Mitsuo Watabe
1-6 Kiba-cho, Minato-ku, Nagoya,
Aichi, Japan 455-0021
TEL +81-52-698-7335

DAMDRE Co., Ltd.
President, Representative Director Tsutomu Sato
Yaesu No.3 Nagaoka Bldg. 6F, 3-22-11Hacchobori, Chuo-ku, Tokyo, Japan
TEL +81 3 5542 3530

President, Representative Director Michihiro Kimura
1-6 Kiba-cho, Minato-ku, Nagoya, Aichi, Japan 455-0021
TEL +81 52 691 7288

CEO Steeve S.Ryoo
6F Busan Shipyard Bldg, 1, Haeyang-ro 15, Yeongdo-gu, Busan, Korea
TEL +82-51-441-0801