The first direct detection of gravitational waves by two LIGO detectors from a binary
black hole merger in 2015 marked the beginning of an era of GW astronomy. Moreover, the
detection of GWs from a binary neutron star merger by the three LIGO-Virgo detectors,
and many other electromagnetic follow-up observations provided new insights into compact
stars and their mergers. It is planned that KAGRA, GW telescope in Japan, joins the
global network of the GW observatories late 2019 as the fourth detector.KAGRA has unique
features such as underground site and cryogenic technique. The current status of KAGRA
toward joining the network observation is presented.