[Technical Problem] To provide an inspection device for inspecting a tissue using reflected light from a tissue, and a control method, a system, a light guide, and a scale of the inspection device. [Solution to Problem] An inspection device 100 of the present invention comprises an imaging device 106 and an inspection module 115 for allowing the imaging device 106 to take a tissue image. The inspection module 115 includes an objective lens 104 for focusing reflected light from a tissue to the imaging device 106； a plurality of LEDs 103a for surrounding the optic axis of the objective lens 104 and exposing light to the tissue； a circular polarization filter 102 comprising polarization state-regulating parts 102a for exposing the light from the LEDs 103a to the tissue directly or as circularly polarized light； and an alignment mechanism 110a for aligning the polarization state-regulating part 102a with the position of the LED 103a.
