The Hyper Supreme-Cam is a gigantic CCD camera attached to the Subaru telescope which consists of 104 chips, providing 1.5 square degrees wide field of view (FOV). The combination of the large aperture of the Subaru together with the wide FOV of the HSC forms the best instrument to search for faint small Solar System bodies. In 2014, the HSC-SSP (Subaru Strategic Program) survey which covers ~1400 square degrees down to ~25 mag was started using a total of 300 nights. Since the researchers from Japan, Taiwan, and Princeton Univ. in the US worked on the development and funding for the instrumentation of the HSC, they have a priority to use the HSC-SSP data set, hence made use of the advantages. Although the main purpose of this survey is not planetary science, the team serendipitously discovered quite a large number of Solar System objects including TNOs in the HSC-SSP survey dataset, to measure their colors. The HSC has also been available for researchers outside the team during the open use time of the Subaru telescope. Using the time slots, we found a number of Jupiter Trojans and investigated their size frequency distribution (SFD). Comparing the SFD of the main belt with that of the Jupiter Trojans, we noticed a possible gradual change in the SFD, which might be a clue to the planet migration in the early Solar System. Using the HSC, we also conduct a survey of the planet 9 (P9) in the outer region of the Solar System. I will talk about the progress in this effort.