The Institute of Laser Engineering, Osaka University, has performed inertial fusion experiments using various kinds of energy drivers, such as the GEKKO series of glass lasers, the LEKKO series of CO2 lasers, and the REIDEN series of light ion beams. – As for the fuel pellet design, the well-known Cannonball target was invented to warrant a uniform compression under laser irradiation. The super-computer SX-2 was introduced to pursue the implosion physics and to optimize the pellet design. – A conceptual scheme for a laser fusion reactor was also investigated. For inertial confinement fusion reactors the SENRI series was proposed.