To make efficient use of light by improving the reflection polarization transforming efficiency.

A first light guide body 3, constituting an incident face and a second light guide body 4 that constitutes a non-flat face shaped emitting face which emits illumination light by diffusing and uniformizing are separated from each other, and the first light guide body 3 and the second light guide body 4 are jointed as a unit via an optically functional film 5, which is interposed over the whole face between the second end face 10 of the flat first light guide body 3 and the first end face 11 of the second light guide body 3, which constitutes a jointed face.