1960s
| December 1966 | Seiryo Electric Corporation was established in Yodogawa-ku, Osaka-shi |  |
|---|---|---|
| February 1968 | Designated as Electronic Equipment Service Depot of Mitsubishi Electric Corporation |  |
| September 1969 | Relocation of headquarters (Toyonaka-shi, Osaka) |  |
1970s
| August 1973 | Became Electronic Equipment Distributor of Mitsubishi Electric Corporation |  |
|---|---|---|
| January 1976 | Seiryo Electric Sales Corporation was established (Sales Division became independent) |
1980s
| November 1981 | Relocation of headquarters (Fujinoki, Amatsuaza, Itami-shi, Hyogo) |  |
|---|---|---|
| April 1984 | Osaka Sales Office was established |
1990s
| June 1992 | Repair and recycling of mobile phones business started |  |
|---|---|---|
| November 1992 | Relocation of headquarters (Chuo, Itami-shi, Hyogo) | |
| May 1994 | Cell-phone sales business started | |
| December 1994 | Tokyo Business Office (current Tokyo Branch) was established |  |
| September 1995 | Took over business rights of Seiryo Electric Sales Corporation and became agent of Mitsubishi Electric Corporation | |
| November 1997 | Relocation of headquarters (Suita-shi, Osaka) | |
| March 1999 | Acquired ownership of Comtec Service Corporation |
2000s
| November 2001 | Inadera Technical Office was established |  |
|---|---|---|
| February 2002 | Listed on Second Section of Osaka Securities Exchange |  |
| April 2002 | Osaka Branch was established |  |
| September 2002 | Relocation of headquarters (Fujinoki, Itami-shi, Hyogo) |  |
| April 2003 | Information Communication Terminal Engineering Business Division Obtained ISO9001 certification | |
| July 2004 | Osaka Branch obtained ISO9001 certification |  |
| November 2004 | PC sales business started (PC DEPOT Minoo Store was established) |  |
| December 2005 | Inadera Technical Office obtained ISO9001 certification | |
| January 2006 | Tokyo Branch obtained ISO9001 certification | |
| September 2008 | Kanagawa Sales Office was established |  |
2010s
| April 2010 | Acquired ownership of Suzuki Engineering Corporation (current Seiryo Electric Fielding Corporation) | |
|---|---|---|
| November 2010 | Inadera Technical Office obtained ISO/IEC27001 certification | |
| January 2012 | East Japan Repair Center was established |  |
| October 2012 | Obtained JISQ15001 privacy mark certification | |
| April 2013 | Kohnan Electronic Corp. (current Seiryo Electric Engineering Corporation) was established |  |
| July 2013 | Acquired ownership of Tottori K.E.C. Corp. (current Tottori Seiryo Electric Corp.) Listed on Second Section of Tokyo Securities Exchange |  |
| July 2013 | Listed on Second Section of Tokyo Stock Exchange |  |
| February 2018 | Inadera Technical Office（technical department）achieved CMMI Level 2 | |
| March 2018 | Relocation of headquarters (Osaka-shi, Osaka) |  |
2020s
| February 2021 | Inadera Technical Office（technical department）achieved CMMI Level 3 |
|---|
| March 2022 | Listed on the Standard Market of Tokyo Stock Exchange, Inc. |
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