  We describe the conceptual design of the spectrograph opto-mechanical concept
for the SuMIRe Prime Focus Spectrograph (PFS) being developed for the SUBARU
telescope. The SuMIRe PFS will consist of four identical spectrographs, each
receiving 600 fibers from a 2400 fiber robotic positioner at the prime focus.
Each spectrograph will have three channels covering in total, a wavelength
range from 380 nm to 1300 nm. The requirements for the instrument are
summarized in Section 1. We present the optical design and the optical
performance and analysis in Section 2. Section 3 introduces the mechanical
design, its requirements and the proposed concepts. Finally, the AIT phases for
the Spectrograph System are described in Section 5.
