沿革

Spatial design began for Tanseisha when our founder, WATANABE Masaji first started remodeling the interior of the newly bustling department stores in Ueno, Tokyo after WWII.
For over seventy years since this humble origin, we have continued to hone our skills and creativity, expanding the field of the general display industry through a multitude of achievements such as our pavilion at the Expo ’70 world fair held in Osaka, the turning point of our company’s history.
When we moved our headquarters to Shinagawa, the doorway of Tokyo, we did so with the intention of it being “the gateway to future design,” and we continue to create space for imaginations to grow while drawing power from our ability to read the times.
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1946年 10月	Founded by WATANABE Masaji (Yanaka, Shitaya-ku).	1949年 10月	The original company name Sanko Co., Ltd. was established in Marunouchi, Chiyoda Ward, Tokyo (later the trade name was officially changed to Nikki Co., Ltd.).
1959年 12月	Reincorporated under the current effective name TANSEISHA Co., Ltd. Headquarters relocated to Kanda Tsukasamachi, Chiyoda Ward, Tokyo.
1961年 11月	Headquarters completed (Yushima, Bunkyo-ku).	1964年 2月	Osaka office established (currently the Kansai branch).	1966年 9月	Registered as contractor (Tokyo Gubernatorial Registration).	1967年 3月	Tanseisha Kosakusho Co., Ltd. founded (currently Tansei TDC Co., Ltd.).	1969年 5月	Registered as contractor (changed to Ministerial Registration).
1971年 1月	Sapporo office established (currently the Sapporo branch).	1972年 12月	Fukuoka office established (currently the Kyushu branch).	1974年 4月	Tohoku office established.	1975年 6月	Registered as an office of a first-class architect (Tokyo Gubernatorial Registration).	1978年 11月	TANSEISHA Co., Ltd. (trade name officially changed from Nikki Co., Ltd. in July of same year) merges with TANSEISHA Co., Ltd. to carry on as a display/decorative design business.                                                                                                                                                        Tansei Business Co., Ltd. founded.	1978年 12月	Headquarters completed (Ueno, Taito-ku).
1983年 9月	Over-the-counter shares registered with the Japan Securities Dealers Association.	1984年 4月	Tansei Information Institute Co., Ltd. founded (currently Tansei Institute Co., Ltd.).	1984年 12月	Nagoya office established (currently the Nagoya branch).	1987年 3月	Shares listed on the Second Section of the Tokyo Stock Exchange.
1997年 2月	Tansei Display Co., Ltd. founded.	1997年 4月	Obtained the Real Estate Trader License (Tokyo Gubernatorial Registration).
2000年 3月	Shares listed on the First Section of the Tokyo Stock Exchange.	2001年 8月	ISO14001 certification acquired.	2002年 4月	Game Co., Ltd. (currently JDN Inc.) becomes subsidiary.	2004年 3月	Tansei Humanet Co., Ltd. founded.	2006年 12月	Obtained Privacy mark usage permit.
2015年 9月	Headquarters completed (Konan, Minato-ku).	2016年 4月	Transitioned to a company with audit and supervisory committee.	2022年 4月	Transitioned to Prime Market, new market segment of Tokyo Stock Exchange.