Patent ID: 8454221

Claim:
A lighting unit comprising: a light guide plate; a light source that is provided on a side of an end serving as a light incident face; and a frame body that holds the light guide plate and the light source, wherein the light guide plate includes: a depressed portion that is depressed from a first side of the light guide plate in a first direction; and a projecting portion that projects from a second side of the light guide plate in the first direction, the second side being opposite the first side, and that is formed at a position on the second side so as to be opposite the depressed portion, wherein a length of the projecting portion in a second direction that crosses the first direction, the first direction and the second direction being in-plane directions, is equal to or smaller than a length of the depressed portion in the second direction, and a length of the projecting portion in the first direction is equal to or smaller than a length of the depressed portion in the first direction.