A design of prototype Infra-Red High-dispersion Spectrograph (IRHS) is described. IRHS is a cryogenic echelle spectrometer for 8.2-m Subaru Telescope, which will operate at 8 to 13 µm with resolving power of 200,000. To achieve such a high dispersion and broad bandwidth, a Germanium immersion echelle grating was adopted. As a preliminary step, we started to develop the proto-type of IRHS (ProtoIRHS) with currently available Ge immersion grating (30×30×72 mm) and one 512×412 Si:As impurity band detector array, which will provide the maximum resolving power of 50,000 at 10 µm with slit width of 0.612 arcseconds (0.48 mm) and two-pixels sampling.

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