Sumitomo Mitsui Construction was born in 2003, merging the DNA of Mitsui Construction and Sumitomo Construction: one belonging to the Mitsui Group and the other from the Sumitomo Group. As the two companies were highly complementary in terms of expertise, major customer base and business franchise, the merger allowed us to establish a solid foundation and improve management efficiency. In a spirit of equality, we merged to transform ourselves into “a company of excellence in technology and management,” which can provide high customer satisfaction, leverage superior technological capability, and enjoy a lean and highly profitable structure in the construction market of the 21st century.

• 1876
  Civil Division is founded from Besshi Copper Mine’s civil engineering section.
• Nishimoto-Gumi is founded by Kenjiro Nishimoto in Wakayama.
  1887
• Nishimoto-Gumi Co., Ltd. is established and head office is relocated to Tokyo.
  1941
• Renamed Mitsui Construction Industry Co., Ltd. with the capital participation of Mitsui Fudosan Co., Ltd.
  1945
• • Refurbishes Hibiya Sanshin Bldg. in Japan’s first joint venture construction project.
    1950
  • 1950
    Besshi Construction Co., Ltd. is founded.
• Renamed Mitsui Construction Co., Ltd.
  1952
• 1957
  Head office is relocated from Niihama to Tokyo.
• 1959
  Completes Arashiyama Bridge, first PC bridge using Dywidag method in Japan.
• Starts construction of Mitsui Annex No. 3, representing first use of curtain wall method in Japan.
  1960
• 1962
  Sumitomo Construction Co., Ltd. is founded through merger with Shizuoka-based Katsuro-Gumi.
• Completes Mitsui Kasumigaseki Bldg., Japan’s first super high-rise building.
  1968
• 1969
  Completes Expo East Gate Bridge, Japan’s first PC cable-stayed bridge.
• Completes 17-story Mita Tsunamachi Park Mansion, then the highest private-sector collective housing complex in Japan.
  1971
• 1973
  Completes Tha Chang Bridge, Thailand’s first PC bridge.
• • Completes Japan’s highest building, the Shinjuku Mitsui Bldg.
    1974
  • 1974
    Completes Hokawazu Bridge, world’s first arch bridge using truss cantilever erection method.
• 1980
  Completes New Nyali Bridge, awarded first OCAJI prize, in Kenya.
• Crown Prince and Princess visit Sri Lankan Parliament Building construction site.
  Receives an order from Oriental Land for theme park construction.
  1981
• • Completes Bell Park City Tower G, the first super high-rise collective housing at over 100 meters high in Japan.
    1987
  • 1987
    Completes OILES Corporation TC Bldg., Japan’s first aseismic building using LRI.
• Completes installation of Japan’s largest caisson foundation for anchorage of the Port of Tokyo Connector Bridge (Rainbow Bridge).
  1988
• 1989
  Completes Asano Bldg., world’s first intermediate floor base isolation building.
• Completes Tohoku’s largest dam, the Sagae Dam.
  Completes world’s first concrete bridge using aramid FRP rods.
  1990
• • Completes Okawabata River City 21 A, Japan’s first full-scale structure made of concrete-filled steel tube columns and steel beams.
    1991
  • 1991
    Completes Kikko Bridge, world’s first three-directional stress ribbon bridge, awarded FIP special prize.
• 1994
  Completes Odawara Blue Way Bridge, world’s first extradosed bridge.
  Completes TV Shizuoka Media City Bldg., world’s first full-scale damped building.
• 1995
  Advertisement on seismic base isolation & damping methods receives Nikkei AD Award.
• 1996
  Completes Yumetsuri Bridge, world’s largest stress riboon bridge.
• 2000
  Receives health and safety award of excellence from U.S. Department of Defense Army COE.
• • Develops Mitsui Flex Tower, a next-generation super high-rise collective housing building.
    2001
  • 2001
    Completes Ibigawa Bridge, world’s first composite extradosed bridge.

2003 Sumitomo Mitsui Construction Co., Ltd. is founded.

• ■ Civil engineering business
• ■ Building construction business
• ■ Overseas business
• ■ New business & construction peripheral business

• 
  ■ Seiun Bridge (Tokushima Prefecture)
  Japan’s first bridge to receive the fib (International Federation for Structural Concrete) Award for Outstanding Concrete Structures
  2004
• 2005
  ■ Yokohama Towering Square
  First adoption of SQRIM method of precasting
  
• 
  ■ Second Mekong International Bridge (Thailand-Laos)
  Crossing the border between Thailand and Laos
  2006
• 2008
  ■ Shimukappu Tunnel (Hokkaido)
  3000-meter extension achieved with centrifugal spraying system
• 
  ■ Yabegawa Ohashi (Fukuoka Prefecture)
  Japan’s largest concrete bridge
  2009
• 2010
  ■ Musashino Towers (Tokyo)
  First adoption of SQRIM-Horizontal method
  
• ■ Park Homes Yokohama Kishine Park Forest Square
  First adoption of SuKKiT
  2012
• 2013
  ■ Terasako Choucho-ohashi (Miyazaki Prefecture)
  World’s first butterfly web bridge Received fib Award for Outstanding Concrete Structures
  
• 
  ■ Neak Loeung Bridge (Tsubasa Bridge) (Cambodia)
  Appears on the 500 riel note
  2015
• ■ Nhat Tan Bridge (Vietnam-Japan Friendship Bridge) (Vietnam)
  Largest bridge in Southeast Asia
  2015
• 2016
  Development of Group Vision and Long-term Management Policies
• 2016
  ■ Yamanashi Culture Hall Seismic Retrofitting Project
  Large-scale seismic retrofitting while allowing the building, which houses a TV station, to remain in use
  
• ■ Hiragioike Floating Solar Power Generation Plant (Kagawa Prefecture)
  First own floating solar power generation project
  2017
• 
  ■ Shin-Meishin Expressway Mukogawa Bridge (Hyogo Prefecture)
  IABSE (International Association for Bridge and Structural Engineering) Outstanding Structure Award Awarded Finalist Prize
  2017
• 2019
  Development of Vision 2030
• Declaration of Globalization
  2020