 It will be a cylinder of 74 meters diameter and 60 meter height with 40000 photomultiplier tubes of 50 cm diameter and 6700 photomultiplier tubes of 20 cm diameter.It will be located 8 km south from the Super-Kamiokande detector in the Tochibora mine, 650 meters under the peak of Nijuugo mountain, at the same off-axis angle (2.5°) to the neutrino beam centre and in the same distance (295 km) from the beam production place at J-PARC.The start of the HK detector construction is planned for 2020 and the start of data collection is expected in 2027.