The High Dispersion Spectrograph (HDS) is located at one of the Nasmyth foci of the Subaru telescope. The maximum resolving power of HDS is 165,000 for the optical wavelength region (3000~10000Å). HDS was constructed as a first-generation instrument for the Subaru telescope, and has successfully achived first-light in July 2000. Open use of this instrument has started in April 2001.