Abstract
Gravitational waves are generated by the violent motion of heavy mass. Therefore, gravitational waves are expected to be a very important new tool to observe the Universe such as the mergers of blackhole binaries or those of neutron star binaries. In fact, gravitational waves have been observed in the LIGO and Virgo laser interferometers. KAGRA is a project trying to observe gravitational waves with 3km×3km arm lengths laser interferometer. It has been constructed in the underground of Kamioka, Japan. KAGRA has unique features such as the underground site to minimize the effect of seismic noises and the cryogenic mirrors to reduce the thermal noises. I will discuss the status of the gravitational wave detection and the KAGRA project.
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