Exploring Early Galaxies and Cosmic Structures with Subaru, HST, and ALMA

I review our recent and on-going observational studies for early galaxies and cosmic reionization with Subaru, HST, and ALMA, highlighting our large-area deep optical imaging survey conducted with Subaru Hyper Suprime-Cam. I introduce the forthcoming massive optical/near-infrared spectroscopic survey with Subaru Prime Focus Spectrograph (PFS), and show forecast-study results for high-z galaxies with PFS.