Super-Kamiokande is a very large neutrino detector with 50,000 ton of pure water. The experiment began in 1996. In 1998, neutrino oscillation was discovered by the studies of atmospheric neutrinos. The discovery and the subsequent studies motivate the further studies of neutrinos. Therefore, the new detector Hyper-Kamiokande is under construction in Kamioka. 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. KAGRA is a laser interferometer with 3km X 3km arm lengths, with cryogenic mirrors and located in underground. I will discuss the neutrino and gravitational wave researches in Kamioka.