MOIRCS (Multi-Object InfraRed Camera and Spectrograph) provides wide-field imaging and long-slit / multi-object (MOS) spectroscopic capabilities in the 0.9 ~ 2.5 µm spectral range under the natural seeing condition. The 4'?~7' field of view is covered by two Hawaii-2 2048?~2048 arrays with the spatial resolution of 0.117 arcsec/pixel.