The Hyper-Kamiokande (HK) experiment utilizes a giant water Cherenkov detector which is larger than the Super-Kamiokande detector. Similar to the SK experiment, it aims to detect neutrinos generated at J-PARC as well as neutrinos from natural sources such as the Sun, supernovae, and the atmosphere, along with exploring the phenomenon of proton decay. Currently, as an international collaborative project, the construction of the new detector is underway.

Toward the HK experiment, the KEK/J-PARC neutrino group is conducting high-intensity operation of the J-PARC neutrino beam, increasing the beam intensity, upgrading the near detectors, and constructing a new intermediate detector. The intermediate detector is planned to be newly constructed at a location approximately 1 km away from J-PARC in the direction of the HK detector.