Display device and television device

A display device comprising:

• a display panel having a display surface on a front side thereof;
• a light source row including light sources arranged in a row;
• a light guide plate being a plate member and including:
• a light entrance surface that is an edge surface of the plate member and opposed to the light source row and through which light from each of the light sources enters the light guide plate,
• a light exit surface that is a front-side surface of the plate member and through which light exits the light guide plate toward a rear side of the display panel,
• a side edge surface that is an edge surface of the plate member adjacent to the light entrance surface, the side edge surface being substantially perpendicular to the light entrance surface and being on an outer side than an edge of the display panel, and
• a positioning projection portion included in the side edge surface at a portion that is close to the light entrance surface, the positioning projection portion projecting outwardly from the side edge surface, the positioning projection portion having a projection, wherein among rays of light emitted from an end light source that is arranged at an end of the light source row and entering the light guide plate through the light entrance surface, narrow-angle light directed outward at an angle α (the angle α is equal to a critical angle θc) with respect to an optical axis of the end light source travels into the projection, and the positioning projection portion including a first edge surface and a second edge surface,
• the first edge surface being an edge surface of the projection that is farthest from the side edge surface and parallel to the side edge surface, and the first edge surface where the narrow-angle light does not reach,
• the second edge surface being an edge surface of the projection between the side edge surface and the first end surface and being parallel to the light entrance surface, and the second edge surface where the narrow-angle light reaches, and the display device further comprising:
• a chassis having a plate shape and configured to cover a rear side of the light guide plate and hold the positioning projection portion therein;
• and
• a recess portion configured to fit to the positioning projection portion to be positioned with respect to the chassis.