To make it possible to visually confirm the lighting of a light emitting element while obtaining good visibility by line of sight from obliquely above even when a display surface is held almost in the same plane as the top surface of a cabinet.

A prism 2 having a light incidence surface 2b receiving the output light beam from the light emitting element 1 arranged at a specific position on a substrate 3 arranged in the cabinet 4 and a flat display surface 2a exposed at a part projecting from the top surface of the cabinet 4 is used to refract and then radiate the received output light beam from the display surface 2a upward obliquely to the top surface of the cabinet 4. Further, the incidence surface is made convex to uniformly radiate the received output light beam from the display surface 2a. Further, the flat surface of a Fresnel lens is stuck to the light incidence surface 2b and the output light beam is received by the Fresnel surface and uniformly radiated from the display surface 2a.