| 1928 |
Shounosuke Imai opened an ironmonger at Goutsu city. |
| 1935 |
Enlarged the market in Osaka area. |
| 1938 |
Started lumber industry. |
| 1942 |
During the war, companies in same industry in the prefecture were all combined. Ohchi Lumber Corporation was established. Shounosuke Imai was assigned to be the managing director. |
| 1946 |
Decontrolled due to the end of the war. Restarted lumber industry. |
| 1949 |
Incorporated as Imai Industry Limited Company.
Capital: 1,360,000 JPY |
| 1950 |
Opened Osaka office. |
| 1953 |
Increased capital to 5,000,000 JPY. |
| 1954 |
Changed into stock company as Imai Corporation. Established San-in Corporation. |
| 1955 |
Changed company purpose of Imai Corporation to Lumber Industry, Civil Engineering and Building Contract. |
| 1958 |
Received registration from the minister of construction and started construction industry. Started to have 2 departments, Civil Engineering and Construction. |
| 1963 |
Shounosuke Imai took office as the chairman of the board. Hisayoshi Imai became CEO. |
| 1972 |
Established Imai Trading Corporation. Lost headquarter building and lumber factory by flood damage. |
| 1974 |
Established Imai House Industry Corporation and started to make house material as Misawa Home’s subcontracting factory. |
| 1975 |
Combined Imai House Industry Corporation as Imai Corporation’s department of housing. Increased capital to 66,000,000 JPY. |
| 1977 |
ncreased capital to 75,000,000 JPY. |
| 1978 |
Increased capital to 81,000,000 JPY. |
| 1982 |
Increased capital to 98,000,000 JPY. Shoyo Corporation joined Imai group. |
| 1988 |
Established Real Estate System Corporation. Built new headquarter building as a 60th anniversary project. Increased capital to 120,000,000 JPY. |
| 1994 |
Increased capital to 144,000,000 JPY. Hisahito Imai became CEO. |
| 1995 |
Opened Imai Museum. |
| 1996 |
Increased capital to 158,400,000 JPY. |
| 1998 |
Increased capital to 200,000,000 JPY. Has been 70 years since the initiation. The department of Housing received ISO9002. |
| 2000 |
Established Imai Net Corporation. |
| 2001 |
The department of Housing received ISO14001.
Merged Imai Real Estate Corporation into Real Estate System Corporation.
|
| 2002 |
The department of Construction received ISO9001. |
| 2003 |
Hisashi Imai became CEO. Juso Corporation joined Imai Group. |
| 2004 |
Established Shoufuku Corporation. |
| 2008 |
Has been 80 years since the initiation. |
