Company overview

  • Message from the President
  • Company overview
  • History
  • Branches and Sales Offices

Message from the President

Ever since Japan Guarantee Service was established in 1984, we have provided support to the streamlining of operations at construction sites through our business in renting out IT equipment. We have deployed cutting-edge products at all times, and provided solutions making use of ICT before other companies in offering proposals for realizing comfortable on-site offices and office spaces.

Particularly with the dramatic advances in IoT in recent years, even people's lifestyles are expected to change drastically, and the needs of our customers are diversifying greatly. The solutions sought after by the construction industry, including tablets, digital signages and beacons, reflect the declining population of workers due to aging and declining birthrates, as well as the social environment due to labor reforms, leading to advances in the extensiveness and depth of issues.

We will continue working closely with each and every customer, so that we will be a company that continues being chosen by them through the making of minor adjustments in our attitudes to further hone our model in the rental and services business. We will offer services that cannot be provided through robotics and AI.

Japan Guarantee Service Co., Ltd.
Representative Director and President
Keiji Koyama

Company overview

Company name
Japan Guarantee Service Co., Ltd.
8F Daito Bldg., 3 Kanda Neribei Town, Chiyoda Ward, Tokyo 101-0022
Phone: 03-6859-5081 Fax: 03-6859-5080
Click here for maps of branches and sales offices
March 1, 1982
May 15, 1984
116,000,000 yen
10.8 billion yen (as of April 2021)
Business description
Rental of IT equipment
Number of employees
250 (as of April 2021)
Chairman of the Board Osamu Koyama
Representative Director and President Keiji Koyama
Main banks
Ueno Branch, Sumitomo Mitsui Banking Corporation / Asakusabashi Branch, Mizuho Bank / Okachimachi Branch, Kiraboshi Bank. Ltd. / Ueno Branch, Shoko Chukin Bank
Main products
Digital color multifunctional machines, large format copiers, PCs, software, plotters, printers, wireless routers, L3 switches, NASs, iPads, interactive projectors, network cameras, cloud cameras, business phones, cordless phones, cell phones, phone lines, internet connections, mobile communication devices, providers, transceivers, office equipment and furnishings, office goods (Biznet), unit/prefabricated houses, video equipment


May, 1984
Established as a company selling OA and communication equipment
January, 1987
Business objective changed from "sales" to "rental services"
January, 1996
Kansai Branch opened
March, 1999
JGS Co., Ltd. established (separation of the Distribution Division)
April, 2001
Chubu and Tohoku Branches opened
February, 2002
Kansai Branch: Completion of office building in Yodogawa Ward
May, 2004
Yokohama Branch opened
November, 2006
Service Center opened
February, 2007
Kyushu Branch opened
January, 2008
Chugoku Branch opened
April, 2009
Kansai Branch: Completion of 2nd office building in Yodogawa Ward
June, 2010
Chubu Branch: Completion of office building in Naka Ward
August, 2012
Morioka Sales Office opened
June, 2013
Kagoshima Sales Office opened
May, 2014
Kanto Branch opened
Sapporo Sales Office opened
February, 2015
Shizuoka Sales Office opened
February, 2016
Head Office and Kanto Branch moved to Chiyoda Ward
March, 2018
Service Center: Completion of office building in Adachi Ward
April, 2020
JGS Lab Co., Ltd. established
July, 2020
Integrated Head Office and Kanto Branch

Branches and Sales Offices

Head Office
8F Daito Bldg., 3 Kanda Neribei Town, Chiyoda Ward, Tokyo 101-0022
Phone: 03-6859-5081 Fax: 03-6859-5080
Service Center
1-1-15 Hitotsuya, Adachi Ward, Tokyo 121-0075
Phone: 03-6847-5881 Fax: 03-6847-5880
Tohoku Branch
39-28 Ginnancho, Miyagino Ward, Sendai City, Miyagi Prefecture 983-0047MAP
Phone: 022-208-9521 Fax: 022-208-9520
Yokohama Branch
2F, K-SPIRE Bldg., 1-5-11 Furo Town, Naka Ward, Yokohama City, Kanagawa Prefecture 231-0032MAP
Phone: 045-640-3191 Fax: 045-640-3192
Chubu Branch
1-4-21 Shinsakae, Naka Ward, Nagoya City, Aichi Prefecture 460-0007MAP
Phone: 052-238-1181 Fax: 052-238-1290
Kansai Branch
4-9-6 Kikawahigashi, Yodogawa Ward, Osaka City, Osaka Prefecture 532-0012MAP
Phone: 06-6885-3231 Fax: 06-6885-3241
Chugoku Branch
1F Padma Heights Kido, 1-2-14 Kusunoki Town, Nishi Ward, Hiroshima City, Hiroshima Prefecture 733-0002MAP
Phone: 082-534-8151 Fax: 082-534-8150
Kyushu Branch
3F Hakata Komatsu Bldg., 1-19-3 Hakataeki-mae, Hakata Ward, Fukuoka City, Fukuoka Prefecture 812-0011MAP
Phone: 092-432-0851 Fax: 092-432-0850
Sapporo Sales Office
3F Fukuyamaminami Sanjo Bldg., 10-1001-5 Minamisanjo-nishi, Chuo Ward, Sapporo City, Hokkaido 060-0063MAP
Phone: 011-208-6271 Fax: 011-208-6290
Morioka Sales Office
1F Sasazen Bldg. Flicker Hokujo, 3-4-5 Minami-odori, Morioka City, Iwate Prefecture 020-0874MAP
Phone: 019-654-5031 Fax: 019-654-5030
Shizuoka Sales Office
4-12-8 Mabuchi, Suruga Ward, Shizuoka City, Shizuoka Prefecture 422-8063MAP
Phone: 054-654-3411 Fax: 054-654-3410
Kagoshima Sales Office
4-7 Tokai Town, Kagoshima City, Kagoshima Prefecture 891-0115MAP
Phone: 099-263-1261 Fax: 099-263-1260
Japan Guarantee Service Co., Ltd.
(Delivery, Installation)
1-1-15 Hitotsuya, Adachi Ward, Tokyo 121-0075MAP
Phone: 03-5851-8461 Fax: 03-5851-8465
JGS Lab Co., Ltd.
(Digital signage design, Manufacturing, Sale)
2F Ishii Iidabashi Bldg., 6-5 Nishigokencho, Sinjuku Ward, Tokyo 162-0812MAP
Phone: 03-5206-3555 Fax: 03-5206-3556


Please do not hesitate to contact us if you have any inquiries regarding our services, business, etc.

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