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.
Scoop the mud from the bottom of the water to make land.
Humans have been doing so not only in Japan but in many countries since the dawn of history. We hear the story of creation, "the land created with the mud from the bottom of the water," not only in Japan but in other countries as well. People created land from shapeless mud, built houses, paved roads, opened markets, nurtured culture, and generated civilization. It is not an exaggeration to say that civil engineering starts with "dredging" that scoops mud.
Port is where trading with countries around the world to sustain our lives takes place. It has a characteristic nature to get filled with sediment flowing from rivers over time. Accumulated sediment in rivers blocks the flow of water, causing floods. Dredging moves sediment allowing the port to function. And it restores the smooth flow of rivers. Sediment can utilize to create land elsewhere.
Kojimagumi has been engaging in the various port civil engineering business, including dredging in the dynamic natural cycle, since its establishment in 1919. We have participated in construction works in and out of Japan with our many dredgers as the world's largest grab dredger, GOSHO. We also have operated many of our unloader vessels, creating new land utilizing dredged material. We are proud to provide a backbone to society maintaining port activities and protecting people's lives from disasters through business.
Severe climate change. Infectious disease crisis as the novel coronavirus. People are looking for a new way of living, cities, and societies that accommodate various changes now. Also, in ports and rivers, we need a new civil engineering work that enables people a continuous secure life.
Kojimagumi will contribute to creating a new society of continuous secure life, developing advanced civil engineering technology, work vessels, and construction machinery utilizing digital technology actively, reaffirming the fundamental meaning of civil engineering of "creating a society."
|Company||KOJIMAGUMI Co., Ltd.||Capital||90,000,000 JPY|
1-6 Kiba-cho, Minato-ku,
Nagoya, Aichi, Japan 455-0021
TEL: +81 52 691 7040
|Established||Jun, 1919||Representative||President, Representative Director
|Reorganized||Dec. 1941||Number of
|196 (As of May, 2020)|
|Business||Dredging/reclamation, civil engineering works and related activities||Constructor
|Licence obtained by Minister of the Ministry of Land, Infrastructure, Transport and Tourism (Special)26-3337
|1919||Jun.||Establish in Ueno-village, Chita-county, Aichi (Current Nawa-machi, Tokai-city)|
|1941||Dec.||Reorganize (Capital 198,000 yen)|
(Horikawa river dredging)
|1954||Mar.||Build a wooden grab dredger
(1 RYOSEI MARU)
|1957||Sep.||Move office to current location|
|1959||Mar.||Build a steel grab dredger
(10 RYOSEI MARU)
|1963||Mar.||Increase the capital to 18,000,000 yen|
|1967||Apr.||Open Tokyo branch|
|1970||Jun.||Build an anchorless grab dredger
(61 RYOSEI MARU)
|1975||Mar.||Patent anchorless moving equipment
|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
(261 RYOSEI MARU)
|1988||May.||Increase the capital to 80,800,000 yen|
|1993||Jul.||Build an air pressure transfer vessel (Air pressure vessel)
(AP 1000 RYOSEI MARU)
|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)|
Hacchobori Chishima Bldg. 6F, 3-22-11Hacchobori, Chuo-ku, Tokyo 104-0032
TEL +81 3 3297 1681
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.
NIHON KOWAN LEASE Co., Ltd.
President, Representative Director Mitsuo Watabe
1-6 Kiba-cho, Minato-ku, Nagoya,
Aichi, Japan 455-0021
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
PACIFIC MARINE JAPAN Co., Ltd.
President, Representative Director Michihiro Kimura
1-6 Kiba-cho, Minato-ku, Nagoya, Aichi, Japan 455-0021
TEL +81 52 691 7288
KR DREDGING CO., LTD
CEO Steeve S.Ryoo
6F Busan Shipyard Bldg, 1, Haeyang-ro 15, Yeongdo-gu, Busan, Korea