Maezawa Kasei Industries Co., Ltd.

Founded as Showa Manufacturing in July 1937

Founded as Showa Seisakusho.

Introducing the history of our company since its establishment in 1954.

In December 1954, 'Maezawa Valve Industry Co., Ltd. (now Maezawa Industries Co., Ltd.)' was established, and the resin division was spun off and became 'Hard Envi Industry Co., Ltd.'

The resin division of "Maezawa Valve Industry Co., Ltd. (now Maezawa Industry Co., Ltd.)" separated and established "Hard Envi Industry Co., Ltd.".

Changed the company name to 'Maezawa Kasei Industries Co., Ltd.' in July 1961

Changed company name to "Maezawa Kasei Industry Co., Ltd.".

Announced resin-made water meter boxes and water stop boxes in September 1964

Announced resin water meter boxes and water stop boxes.

Launched water valve columns in September 1965

Launched water tap posts.

Established the Tsumagoi Factory in November 1969

Established the Wife-numa Factory.

Launched Maezawa VU fittings in May 1980

Launched Maezawa VU fittings.

Launched invert fittings (now Vinimas System) in August 1982

Launched the Invert Fittings (now BiniMass System).

Launched vinyl chloride small manholes 'Vinihole System' in April 1993

Launched vinyl chloride small manholes "BiniHole System".

Went public on the over-the-counter market in September 1993

Listed on the over-the-counter market.

Obtained ISO 9001 quality management system certification in March 1999

Obtained certification for the quality management system "ISO 9001".

Listed on the Second Section of the Tokyo Stock Exchange in February 2000

Listed on the Second Section of the Tokyo Stock Exchange

Launched foundation through sleeves in January 2001

Launched a through-wall sleeve

Listed on the First Section of the Tokyo Stock Exchange in March 2001

Listed on the First Section of the Tokyo Stock Exchange

Completed Tsumagoi Second Factory in March 2002

Completion of the Second Factory in妻沼

Launched Vinyl Header in July 2002

Launched a vinyl header

Obtained ISO 14001 environmental management system certification in October 2002

Certified for Environmental Management System "ISO 14001"

Completed the second phase of Tsumagoi Second Factory and started operation in September 2005. Simultaneously, the Todako Factory was closed, and the Kumagaya First and Second Factories began operation.

Completion of the second phase expansion of the妻沼 second factory, closure of the戸田 factory, start of operation at熊谷 first and second factories

In January 2008, it became a consolidated subsidiary of "Kyowa Seikei Co., Ltd. (now Niigata Seikei Co., Ltd.)".

Made Kyowa Molding Co., Ltd. (now Niigata Molding Co., Ltd.) a consolidated subsidiary

In May 2011, established a local joint venture in China, "Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd.".

Established a local joint venture in China, Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd.

In February 2013, made "Niigata Seikei Co., Ltd." a 100% subsidiary.

Made Niigata Molding Co., Ltd. a 100% subsidiary

In November 2015, completed the construction of a new building at Kumagaya First Factory and started operation.

Construction completion and start of operation of the new building at熊谷 first factory

In June 2016, developed and launched the resin single-pipe drainage system "ViniCore".

Developed and launched a resin-made single-pipe drainage system "Vinicoa"

In February 2018, transferred shares of the Chinese joint venture "Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd." and withdrew.

Transferred shares of the Chinese joint venture Zhejiang Qianze Jiasheng Drainage Materials Co., Ltd. and withdrew

Transitioned to the Prime Market of the Tokyo Stock Exchange

In April 2022, transitioned to the Tokyo Stock Exchange Prime Market.

In October 2022, made "Joyo Waterworks Industry Co., Ltd." a consolidated subsidiary.

Made Joyo Waterworks Industry Co., Ltd. a consolidated subsidiary

In April 2026, was excluded from the consolidated subsidiaries due to the transfer of shares of "Niigata Seikei Co., Ltd.".

Excluded from consolidated subsidiaries due to share transfer of Niigata Molding Co., Ltd.

Became a wholly owned subsidiary of Maezawa Holdings Co., Ltd. through a joint share transfer with Maezawa Industries Co., Ltd.