To create an image capable of stably monitoring a state of a crew member while suppressing enlargement of a composition of a whole device and suppressing an increase in power consumed by a projector as much as possible in a state monitor.

An optical member 11 used in a state monitor for monitoring a state of a crew member by image processing an image created by an imaging section distributes radiation light emitted by a light emission unit in a stipulated area includes: a projection 62, an introduction unit 64, a reflection unit 66, a cylindrical unit 77 and prism units 79, 83. In the optical member 11, illumination light made incident from the projection 62 is guided to a cylindrical unit 77 of an ejection unit 75 through a connection surface 68 and deflected when passing through a cylindrical surface 89. The illumination light made incident from an inner periphery surface 72 of the introduction unit 64 and guided to the prism units 79, 83 is deflected when passing through inclinations 81, 85. Thus, distribution characteristic for the stipulated area is obtained.