Hyperspectral Imager Suite (HISUI) is a spaceborne imaging spectrometer being developed by Ministry of Economy, Trade, and Industry (METI) of Japan for the deployment on International Space Station (ISS) Japan Experiment Module (JEM) in FY2018. It will be METI’s fourth spaceborne optical imaging system after JERS-1 OPS (1992 –1998), ASTER (1999 ), and ASNARO-1 (2014 ). HISUI has one reflective telescope, two grating spectrometers, two area detectors, and a mechanical cooler, and covers 0.4 2.5 μm spectral region with 185 spectral bands, 20 m (cross track) x 30 m (along track) spatial resolution, and 20 km swath, from the altitude of 400 km. The basic specifications of HISUI are summarized in Table 1.