| 1840 | Iwakichi Kajima begins carpentry business in Edo (present day Tokyo) |
| 1860 | Kajima pioneers first Western-style building in Yokohama
(Ei-Ichiban Kan: Jardine Matheson’s trade house) |
| 1880 | Establishes Kajima Gumi (first company name) |
| 1891 | Construction begins on the Usui Railway Line |
| 1899 | Railway construction projects begin in Korea and Taiwan |
| 1924 | Completes Japan's first concrete dam (Ohmine Dam) |
| 1949 | Founds the Kajima Technical Research Institute (first research facility in Japanese construction industry) |
| 1957 | Completes Japan's first nuclear reactor |
| 1963 | Attain the world No.1 construction company ranking (by total contract value)
Constructs facilities for Tokyo Olympic Games
Completes the New Tanna Tunnel for the Shinkansen |
| 1964 | Establishes Kajima International Incorporated (KII) in Los Angeles, CA, U.S.A. |
| 1968 | Completes Japan's first high-rise building (Kasumigaseki Building) |
| 1969 | Kajima Design Division wins the design competition for new Supreme Court building |
| 1971 | Completes 47-story Keio Plaza Hotel (Japan's first super-high-rise hotel) in Shinjuku |
| 1972 | Completes new Supreme Court building project |
| 1974 | Completes various high-rise building in Tokyo |
| 1978 | Completes the International Trade Center in Berlin |
| 1982 | Receives the Deming Prize of TQC |
| 1983 | Establishes Chung-Lu Sino-Kajima Construction Co., Ltd. in Taiwan |
| 1984 | Completes the New Kokugikan Sumo Arena in Tokyo |
| 1987 | Establishes Kajima Europe B.V. (KE) in Netherlands |
| 1988 | Establishes Kajima Overseas Asia Pte. Ltd. (KOA) in Singapore
Completes the Seikan Tunnel in Japan (world's longest tunnel of about 54km) |
| 1990 | Completes the tallest building in Europe, Messe Turm in Frankfurt |
| 1994 | Completes the Kansai International Airport in Osaka |
| 1995 | Renovates the Suez Canal tunnel in Egypt |
| 1997 | Completes the Tokyo Bay Aqualine |
| 1998 | Completes the Akasi Kaikyo Bridge |
| 2001 | Opens the Kajima Warsaw office |
| 2002 | Establishes Kajima Europe Sp.zo.o branch in Poland
Establishes Kajima Europe B.V. Czech branch
Completes Saitama Stadium for 2002 FIFA World Cup |
| 2004 | Establishes of Kajima (Shanghai) Construction Co.,Ltd in China |