| January 1927 | Founded Terawaki Electric Company in Nishi-ku, Osaka (later renamed Tamaden Co., Ltd.)
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| January 1948 | Yamanaka Electric Co., Ltd. Established | |
| February 1970 | Tamaden Co., Ltd. and Yamanaka Electric Co., Ltd. merged to form Nihon Densho Co., Ltd. |  |
| May 1972 | Opening of Product Center in Suita, Osaka | |
| September 1974 | Tokyo Branch Office Building Completed in Adachi, Tokyo | |
| September 1975 | Opening of Disaster Prevention Equipment Sales Office in Suita, Osaka | |
| January 1976 | Opening of Senshu Sales Office in Izumisano, Osaka | |
| October 1977 | Ebisu Building Completed in Naniwa, Osaka
Opening of FA Sales Office in Minami, Osaka |  |
| July 1983 | Opening of Senboku (currently Senshu) and Minami FA Sales Offices in Sakai, Osaka | |
| November 1987 | Opening of 307 Higashi FA Sales Office in Ibaraki, Osaka | |
| June 1990 | Capital increased to 263 million yen | |
| July 1991 | Opening of Nagoya Sales Office in Kasugai, Aichi | |
| November 1997 | Opening of Kobe Information System Sales Office (currently Disaster Prevention Kobe) in Higashinada, Kobe | |
| April 2003 | Nihon Densho Vision System, a wholly owned subsidiary of Nihon Densho, was established. | |
| November 2007 | The former Kita Sales Office and Itani Sales Office were merged, and the new Kita Sales Office was later opened in Ikeda City, Osaka. |  |
| January 2009 | The Fukushima Sales Office was relocated to Minato-ku, Osaka, and renamed the Nishi Sales Office. | |
| Nihon Densho Vision System was relocated to Minato-ku, Osaka. | |
| April 2009 | Opening of Housing Electrical Materials Sales Office in Naniwa-ku |  |
| The Information System Sales Office was renamed to Disaster Prevention Higashi, and the Kobe Information System Sales Office was renamed to Disaster Prevention Kobe. | |
| Opening of Disaster Prevention Nishi Sales Office in Minato-ku, Osaka | |
| Opening of LS Sales Division in Naniwa-ku, Osaka | |
| April 2010 | Relocation of Tokuhan Office (Kita-ku, Osaka City) | |
| Opening of Tokuhan Business Center in Kita-ku, Osaka | |
| October 2010 | Opening of FA Sales Office in Naniwa-ku, Osaka | |
| April 2011 | Opening of FA Business Center in Naniwa-ku, Osaka | |
| April 2012 | Higashi Sales Office and Disaster Prevention Higashi Sales Office were relocated to Tsurumi-ku, Osaka. |  |
| Opening of Housing Electrical Materials Tokai Sales Office in Kasugai, Aichi | |
| Opening of Housing Electrical Materials Kanto Sales Office in Adachi-ku, Tokyo | |
| Opening of Housing Business Center in Kasugai, Aichi | |
| October 2012 | Opening of Disaster Prevention Higashi Sales Office and Tokyo FA Sales Office in Adachi-ku, Tokyo | |
| April 2014 | Opening of Disaster Prevention Higashi Sales Office and Disaster Prevention Business Center in Adachi-ku, Tokyo | |
| Opening of Electrical Materials Delivery Business Center in Ikeda, Osaka | |
| Opening of Tokuhan business Logistics Center (Kita-ku, Osaka City) | |
| October 2014 | Opening of Disaster Prevention Business Center Kinki in Tsurumi-ku, Osaka | |
| Opening of Kyushu Sales Office and Housing Electrical Materials Kyushu Branch Office in Hakata-ku, Fukuoka |  |
| April 2015 | The Amagasaki Sales Office and Kita Sales Office were merged, followed by the opening of the Hanshin Sales Office in Ikeda City, Osaka. | |
| The Sennan Sales Office and Sakai Sales Office were merged, followed by the opening of the Senshu Sales Office in Sakai, Osaka. | |
| Disaster Prevention Kanto Sales Office relocated to Atsugi, Kanagawa | |
| November 2016 | Tokyo Sales Office and Housing Electrical Materials Kanto Sales Office |  |
| Disaster Prevention Tokyo Sales Office and Disaster Prevention Business Center | |
| Tokyo FA Sales Office relocated to Arakawa, Tokyo | |
| October 2017 | Opening of Housing Business Center Nishinihon in Naniwa-ku, Osaka | |
| April 2018 | The Housing Electrical Materials Kyushu Branch Office was upgraded to the Housing Electrical Materials Kyushu Sales Office. | |
| Opening of Yokohama Sales Office (Yokohama, Kanagawa) and Hiroshima Branch Office (Minami-ku, Hiroshima) | |
| October 2018 | Opening of Nishi-ku FA Sales Office in Hakata, Fukuoka | |
| November 2018 | Opening of Disaster Prevention Tokai Sales Office in Naka-ku, Nagoya | |
| October 2019 | Opening of Tokuhan Tokyo Business Center in Adachi-ku, Tokyo | |
| April 2020 | Established the Market Development Division and Construction Management Division. | |
| Kousuke Terawaki became Chairman of Nihon Densho. | |
| Kazuaki Yamanaka became President of Nihon Densho. | |
| January 2021 | Osaka FA Sales Office, Minami Sales Office, Housing Electrical Materials Kansai Sales Office, FA Business Center, Sales Support Center
Construction Management Division,Overseas Procurement Division,Market Development Division,
was relocated (Hirano-ku, Osaka City). |  |
| April 2021 | The Tokuhan Business Center was renamed the Tokuhan Business Center West Japan, and the Tokuhan Tokyo Business Center was renamed the Tokuhan Business Center East Japan. | |
| The Hiroshima Branch Office was upgraded to the Hiroshima Sales Office. | |
| August 2021 | Relocation of Keihin Sales Office and Housing Electrical Materials Kanto Sales Office (Shinagawa-ku, Tokyo) | |
| April 2022 | Opening of Matsuyama Sales Office in Matsuyama, Aichi | |
| Disaster Prevention Business Center Kinki was renamed to Disaster Prevention Business Center Nishinihon.
Disaster Prevention Business Center Kanto was renamed to Disaster Prevention Business Center Higashi Nihon. | |
| The Osaka FA Sales Office and Minami FA Sales Office were merged. | |
| Kansai FA the first sales office ,kansai the first sale scound sales office ,kansai the third sales office reorganization | |
| Subsidiary Nihon Densho Vision Systems Co., Ltd. changed its name to V-MUST Co., Ltd. and relocated its head office (Yodogawa-ku, Osaka City). | |
| May 2022 | Chuo Sales Office relocation (Minato-ku, Osaka) | |
| Sales Planning Division opened (Kita-ku, Osaka) | |
| March 2023 | Disaster Prevention Kanto Sales Office relocated (Yokohama City, Kanagawa Prefecture) | |
| April 2023 | Disaster Prevention North Kanto Sales Office (Saitama City, Saitama Prefecture) and Tokyo FA Sales Office North Kanto Branch Office (Kuki City, Saitama Prefecture) opened. | |
| October 2023 | Established Tokai Sales Office (Nagoya, Aichi Prefecture) and Chubu Development Section of Tokkan Development Group (Nagoya, Aichi Prefecture) | |
| April 2024 | Opening of Tokyo Head Office (Shinagawa-ku), Disaster Prevention Kyushu Sales Office (Hakata-ku), and East Japan Product Center (Arakawa-ku) | |
| Tokyo FA sales office, tokyo sales office , kyohan sales office ,Tokuhan business center higasi nihon ,Tokuhan development group capital development division
Relocated to (tokyo shinagawa) | |
| The Disaster Prevention Higashi Sales Office and Disaster Prevention Nishi Sales Office were merged, followed by the opening of the Disaster Prevention Kansai Sales Office. | |
| May 2024 | Disaster Prevention Kansai Sales Office building completed in Higashi, Mikuriyahigashi, Osaka | |
| October 2024 | Tokuhan Sales Office and Tokuhan Business Center Nishinihon were relocated to Tsurumi, Osaka. | |
| Head Office,Sales planning group,housing electrical materials Kansai sales relocated to Osaka Chuoku | |