| 1966 |
神奈川県川崎市にイリソ電子工業株式会社を創業 |
| 1966 |
シンガポールに各種ピン及び多極コネクタの製造・販売を目的としてIRS（S）PTE.,Ltd.を設立し、海外展開を開始 |
| 1966 |
中国に製造子会社として上海意力速電子工業有限公司（上海工場）を設立 |
| 1966 |
アメリカに販売子会社としてIRISO U.S.A.,Inc.を設立 |
| 1966-12 |
神奈川県川崎市下沼部にイリソ電子工業株式会社を設立 |
| 1966-12 |
Established IRISO Electronics Co., Ltd. in Shimonumabe, Kawasaki-shi, Kanagawa. |
| 1966-12 |
Established IRISO Electronics co.,ltd. in Kawasaki City, Kanagawa Prefecture. |
| 1973-04 |
プリント基板上で電線を巻き付けて接続するラッピングピンを開発し、製造、販売を開始 |
| 1973-04 |
Developed wrapping pins whereby wire is wrapped around to make a connection on a PCB, and began producing and selling them. |
| 1973-04 |
Started manufacturing and selling wrapping pins. |
| 1975-01 |
プリント基板上で部品面側より回路を接続するジャンパーピンを開発し、製造、販売を開始 |
| 1975-01 |
Developed jumper pins which connect circuits on the parts side of PCBs, and began producing and selling them. |
| 1975-05 |
Started manufacturing and selling pin headers. |
| 1975-12 |
樹脂部分とピンを合体させることにより、接続のパターンを広げるピンヘッダー（雄コネクタ）の製造、販売を開始 |
| 1975-12 |
Started manufacturing and selling pin headers (male connectors) that expand connection patterns by combining the resin part with the pin. |
| 1977-01 |
プリント基板上で基板の動作チェックを行うチェックピンを開発し、製造、販売を開始 |
| 1977-01 |
Developed check pins which check a PCB's behavior on itself, and began producing and selling them. |
| 1977-05 |
本社及び工場を神奈川県川崎市高津区に移転 |
| 1977-05 |
Moved the headquarters office and plant to Takatsu-ku, Kawasaki-shi, Kanagawa. |
| 1977-09 |
先端部をテーパ状に加工したコネクタ用ピンを開発し、製造、販売を開始 |
| 1977-09 |
Developed connector pins with a tapered tip, and began producing and selling them. |
| 1978-12 |
シンガポール共和国に各種ピン及び多極コネクタの製造、販売を目的としてIRS (S) PTE LTDを設立 |
| 1978-12 |
IRS (S) PTE LTD is established in the Republic of Singapore for the purpose of manufacturing and selling various pins and multi-pole connectors. |
| 1978-12 |
Established IRS (S) PTE., Ltd. in Singapore for the purpose of manufacturing and selling various pin and multi-pin connectors, and started overseas expansion. |
| 1980-03 |
神奈川県川崎市中原区にアイアールエス精工株式会社を設立 |
| 1980-03 |
Established IRS PRECISION Co., Ltd. in Nakahara-ku, Kawasaki-shi, Kanagawa for producing and selling precision metal machining equipment. |
| 1981-11 |
大阪府大東市に大阪営業所を開設（1990年2月に移転） |
| 1981-11 |
Opened Osaka Sales Office in Daito-shi, Osaka. (Moved to Chuo-ku, Osaka in February, 1990.) |
| 1982-07 |
スイッチの機能を持つ短絡用コネクタの製造、販売を開始し、本格的にコネクタ分野へ進出 |
| 1982-07 |
Began producing and selling jumper connectors which have a switching function, and made a full-scale entry into the connector field. |
| 1983-01 |
Full-scale entry into the connector field with the start of manufacturing and sales of short-circuit connectors with switch functions. |
| 1983-11 |
アイアールエス精工株式会社は茨城イリソ電子工業株式会社に社名変更し、本社を神奈川県川崎市中原区から茨城県那珂郡大宮町に移転（現・茨城工場） |
| 1983-11 |
Changed the name from IRS Precision Co., Ltd. to Ibaraki IRISO Electronics Co., Ltd., and transferred the headquarters from Nakahara-ku, Kawasaki-shi, Kanagawa to Omiya-machi, Naka-gun, Ibaraki (present Ibaraki Plant). |
| 1983-11 |
Built Ibaraki Plant in Hitachi-Omiya, Ibaraki Prefecture. |
| 1986-02 |
茨城県那珂郡大宮町に東関東営業所を開設 |
| 1986-02 |
Opened Higashikanto Sales Office in Omiya-machi, Naka-gun Ibaraki. |
| 1986-07 |
岩手県水沢市（現・奥州市）に東北営業所を開設 |
| 1986-07 |
Opened Tohoku Sales Office in Mizusawa-shi, Iwate. |
| 1987-12 |
プリント基板同士を接続するBtoBコネクタの製造、販売を開始 |
| 1987-12 |
Started manufacturing and selling Board to Board Connector connectors that connect printed circuit boards. |
| 1987-12 |
Developed a Board to Board Connector that connects printed circuit boards, and started sales to car audio manufacturers. |
| 1988-12 |
Started manufacturing and sales of FPC connectors that connect flexible printed circuit boards. |
| 1989-01 |
弾力性のあるプリント基板を接続するフレキシブルプリントサーキットコネクタ（FPC用コネクタ）の製造、販売を開始 |
| 1989-01 |
Began producing and selling connectors for flexible printed circuits (FPC connectors). |
| 1991-07 |
Developed a Floating type Board to Board Connector that absorbs misalignment between printed circuit boards for connection, and started manufacturing and sales. |
| 1992-01 |
フィリピン共和国マニラ市マカティ地区にフィリピン事務所を開設（1999年6月にモンテンルパ地区に移転、2002年9月にキャビテ地区に再移転） |
| 1992-01 |
Philippine office opened in Makati, Manila, Philippines. |
| 1993-01 |
香港に香港営業所を設置 |
| 1993-01 |
Opened Hong Kong Sales Office in Hong Kong. |
| 1993-06 |
中華人民共和国上海市に各種ピン及び多極コネクタの製造を目的として上海意力速电子工业有限公司を設立 |
| 1993-06 |
Shanghai Yilisou Electronics Co., Ltd. is established in Shanghai, People's Republic of China for the purpose of manufacturing various pins and multi-pole connectors. |
| 1993-06 |
Established SHANGHAI IRISO ELECTRONICS CO.,LTD (Shanghai Factory) as a manufacturing subsidiary in China. |
| 1994-03 |
Established IRISO USA, Inc. as a sales subsidiary in the United States. |
| 1994-04 |
米国イリノイ州シカゴに各種ピン及び多極コネクタの販売を目的としてIRISO U.S.A., INC.を設立（2004年8月にミシガン州に移転） |
| 1994-04 |
IRISO USA, INC. is established in Chicago, Illinois, USA for the purpose of selling various pins and multi-pole connectors. |
| 1994-09 |
日本証券業協会（現・東京証券取引所ジャスダック市場）に株式を店頭登録 |
| 1994-09 |
Registered over-the-counter stock with the Securities Dealers Association of Japan (present Tokyo Stock Exchange JASDAQ Market). |
| 1994-12 |
ベルギー共和国ブリュッセルに欧州営業所を開設 |
| 1994-12 |
Opened Europe Sales Office in Brussels, Belgium. |
| 1995-02 |
タイ王国バンコク市にタイ事務所を開設 |
| 1995-02 |
Opened Thailand Office in Bangkok, Thailand. |
| 1996-01 |
フィリピン共和国キャビテ地区にIRISO ELECTRONICS PHILIPPINES, INC.を設立 |
| 1996-01 |
IRISO ELECTRONICS PHILIPPINES, INC. established in Cavite, Philippines. |
| 1996-03 |
ドイツ連邦共和国に欧州営業所ドイツ連絡事務所を開設 |
| 1996-03 |
Opened Europe Sales Office Germany Liaison Branch in Germany. |
| 1996-03 |
Established European sales office in Germany (became a sales subsidiary in 2000). |
| 1996-04 |
シンガポール共和国にシンガポール営業所を開設 |
| 1996-04 |
Opened Singapore Sales Office in Singapore. |
| 1996-06 |
ISO9001の認証を取得 |
| 1996-06 |
Obtained ISO 9001 certification. |
| 1996-06 |
Established IRISO ELECTRONICS PHILIPPINES, INC. (Philippines Plant) as a manufacturing subsidiary in the Philippines. |
| 1998-09 |
神奈川県川崎市高津区に株式会社イリソコンポーネントを設立 |
| 1998-09 |
IRISO Components Co., Ltd. was established in Takatsu Ward, Kawasaki City, Kanagawa Prefecture. |
| 1999-10 |
シンガポール共和国トゥアス地区にIRISO ELECTRONICS SINGAPORE PTE., LTD.を設立（営業所の業務を移管） |
| 1999-10 |
Established IRISO ELECTRONICS SINGAPORE PTE., LTD. in Tuas District, Singapore. |
| 1999-11 |
香港にIRISO ELECTRONICS(HONG KONG)LIMITEDを設立（営業所の業務を移管） |
| 1999-11 |
IRISO ELECTRONICS (HONG KONG) LIMITED established in Hong Kong. |
| 2000 |
ドイツに欧州営業所を設立（2000年に販売子会社化） |
| 2000 |
フィリピンに製造子会社としてIRISO ELECTRONICS PHILIPPINES, INC.(フィリピン工場）を設立 |
| 2000 |
中国に販売子会社として意力速（上海）貿易有限公司を設立 |
| 2000 |
ベトナムに製造子会社としてIRISO ELECTRONICS VIETNAM CO., LTD.（ベトナム工場）を設立 |
| 2000 |
中国に製造子会社として、南通意力速電子工業有限公司（南通工場）を設立 |
| 2000 |
インドに販売子会社として、IRISO ELECTRONICS INDIA PRIVATE LIMITEDを設立 |
| 2000 |
韓国に販売子会社として、 IRISO ELECTRONICS KOREA CO., LTD.を設立 |
| 2000-04 |
ドイツ連邦共和国にIRISO Electronics Europe GmbHを設立（欧州営業所及びドイツ連絡事務所の業務を移管） |
| 2000-04 |
IRISO Electronics Europe GmbH established in Germany. |
| 2000-09 |
QS9000の認証を取得 |
| 2000-09 |
Obtained QS 9000 certification. |
| 2000-10 |
中華人民共和国上海市に意力速(上海)贸易有限公司を開設 |
| 2000-10 |
Established Yilispeed (Shanghai) Trading Co., Ltd. in Shanghai, People's Republic of China. |
| 2000-11 |
ISO14001の認証を取得 |
| 2000-12 |
Established IRISO (SHANGHAI)TRADING CO., LTD. as a sales subsidiary in China. |
| 2001-11 |
Obtained ISO14001 certification. |
| 2002-04 |
IRS (S) PTE LTD とIRISO ELECTRONICS SINGAPORE PTE., LTD.を結合し、販売子会社とする（会社名をIRS (S) PTE LTDとし、機能を移管） |
| 2002-04 |
Merged IRS (S) PTE LTD and IRISO ELECTRONICS SINGAPORE PTE., LTD. to form a sales subsidiary, changing the company name to IRS (S) PTE LTD. |
| 2002-11 |
中華人民共和国大連市に意力速(上海)贸易有限公司 大連事務所を開設 |
| 2002-11 |
Opened Dalian Office of Yilispeed (Shanghai) Trading Co., Ltd. in Dalian, People's Republic of China. |
| 2003-03 |
タイ王国バンコク市にIriso Electronics (Thailand) Ltd.を設立（業務を移管） |
| 2003-03 |
Iriso Electronics (Thailand) Ltd. was established in Bangkok, Thailand. |
| 2004-03 |
資本金を22億4,025万円に増資 |
| 2004-03 |
Increased capital to 2,240,250,000 yen. |
| 2004-06 |
中華人民共和国天津市に意力速(上海)贸易有限公司 天津出張所を開設 |
| 2004-06 |
Opened the Tianjin Branch of Yilispeed (Shanghai) Trading Co., Ltd. in Tianjin, People's Republic of China. |
| 2004-09 |
愛知県名古屋市に中部営業所を開設 |
| 2004-09 |
Opened Chubu Sales Office in Nagoya-shi, Aichi. |
| 2005 |
Automotive market sales exceed 50% (FY2005). |
| 2005-05 |
中華人民共和国蘇州市に意力速(上海)贸易有限公司 蘇州出張所を開設 |
| 2005-05 |
Established Suzhou Branch of Yilispeed (Shanghai) Trading Co., Ltd. in Suzhou City, People's Republic of China. |
| 2005-06 |
大韓民国安養市にIRISO ELECTRONICS（H.K.）LTD. 韓国出張所を開設 |
| 2005-06 |
Opened IRISO Electronics(HK)Ltd.Korea Branch Office in Korea. |
| 2005-11 |
資本金を34億9,023万円に増資 |
| 2005-11 |
Increased capital to 3,490,230,000 yen. |
| 2006-01 |
Established IRISO ELECTRONICS VIETNAM CO., LTD. (Vietnam Plant) as a manufacturing subsidiary in Vietnam. |
| 2006-08 |
台湾台北市にIRISO ELECTRONICS（H.K.）LTD. 台湾事務所を開設 |
| 2006-08 |
Opened IRISO Electronics(HK)Ltd.Taiwan Branch Office in Taiwan. |
| 2006-11 |
ベトナム社会主義共和国ハノイ市にIRISO ELECTRONICS VIETNAM CO., LTD.を設立 |
| 2006-11 |
IRISO ELECTRONICS VIETNAM CO., LTD. established in Hanoi, Socialist Republic of Vietnam. |
| 2007-01 |
資本金を53億9,800万円に増資 |
| 2007-01 |
Increased capital to 5,398,000,000 yen. |
| 2007 |
Developed double-sided Floating Board to Board Connector and started manufacturing and sales. |
| 2007-02 |
Increased capital to 5,640,050,000 yen. |
| 2007-05 |
Head office (IRISO Technology Park) completed and relocated to Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa Prefecture. |
| 2007-12 |
神奈川県横浜市港北区新横浜にイリソテクノロジーパーク竣工、同施設内に本社機能を移転 |
| 2007-12 |
IRISO Technology Park completed in Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa Prefecture, and the head office functions relocated to this facility. Established a Production Technology Development Center in Takatsu Ward, Kawasaki City. |
| 2008-08 |
中華人民共和国上海市に意力速（上海）电子技术研发有限公司を設立 |
| 2008-08 |
Established Yilispeed (Shanghai) Electronic Technology Research Co., Ltd. in Shanghai, People's Republic of China. |
| 2010 |
Developed 2-point contact Board to Board Connector and started manufacturing and sales. |
| 2010-12 |
インド共和国バンガロール市にIRISO Electronics Co.,Ltd. India Liaison Office.を開設 |
| 2010-12 |
Established IRISO Electronics Co., Ltd. India Liaison Office in Bangalore, India. |
| 2011-06 |
中華人民共和国重慶市に意力速(上海)贸易有限公司 重慶出張所を開設 |
| 2011-06 |
Opened the Chongqing Branch of Yilispeed (Shanghai) Trading Co., Ltd. in Chongqing, People's Republic of China. |
| 2013-02 |
US販社にアトランタオフィスを開設 |
| 2013-02 |
US sales company opens Atlanta office. |
| 2014 |
Succeeded in developing the industry's first and world's first technology, the 3D Floating Board to Board Connector "Z-Move structure™" with excellent vibration resistance. |
| 2016-06 |
東京証券取引所市場第一部へ市場変更 |
| 2016-06 |
Listed in the First Section of the Tokyo Stock Exchange, transferred from JASDAQ (Standard). |
| 2016-06 |
Market changed to the First Section of the Tokyo Stock Exchange. |
| 2016-09 |
中華人民共和国江蘇省南通市に南通意力速电子工业有限公司を設立 |
| 2016-09 |
Established Nantong Yili Speed Electronics Industry Co., Ltd. in Nantong City, Jiangsu Province, People's Republic of China. |
| 2018-04 |
Established Nantong Yili Electronics Industrial Co., Ltd. (Nantong Plant) as a manufacturing subsidiary in China. |
| 2022-04 |
有限会社エスジーディを株式譲受により完全子会社化し、当会社の商号を有限会社イリソエンジニアリングに変更。東京証券取引所市場第一部からプライム市場へ移行 |
| 2022-04 |
S.G.D. Co., Ltd. becomes a wholly owned subsidiary through a stock transfer, and the company name is changed to IRISO Engineering Co., Ltd. Moved from the First Section of the Tokyo Stock Exchange to the Prime Market. |
| 2022-04 |
Moved from the First Section of the Tokyo Stock Exchange to the Prime Market. |
| 2023-09 |
インド・カルナータカ州にIRISO ELECTRONICS INDIA PRIVATE LIMITEDを設立 |
| 2023-09 |
IRISO ELECTRONICS INDIA PRIVATE LIMITED was established in Karnataka, India. |
| 2023-09 |
Established IRISO ELECTRONICS INDIA PRIVATE LIMITED as a sales subsidiary in India. |
| 2024-01 |
有限会社イリソエンジニアリングを吸収合併 |
| 2024-01 |
Merged with IRISO Engineering Co., Ltd. |
| 2025-04 |
秋田県横手市に秋田工場を開設 |
| 2025-04 |
Opened Akita Plant in Yokote City, Akita Prefecture. |
| 2025-04 |
Planned to build Akita Plant in Yokote City, Akita Prefecture. |
| 2026-04 |
大韓民国京畿道安養市にIRISO ELECTRONICS KOREA CO., LTD.を設立 |
| 2026-04 |
Established IRISO ELECTRONICS KOREA CO., LTD. in Anyang City, Gyeonggi Province, South Korea. |
| 2026-04 |
Established IRISO ELECTRONICS KOREA CO., LTD. as a sales subsidiary in South Korea. |
| 2026-05 |
台湾台北市に日商意力速電子股份有限公司 台灣分公司を設立 |
| 2026-05 |
Established IRISO ELECTRONICS CO., LTD. TAIWAN BRANCH in Taipei, Taiwan. |
