Light guide plate, planar light source apparatus, display apparatus, and electronic device

A planar light source comprising a light emitting element, and a light guide plate which guides light emitted from the light emitting element, the planar light source apparatus further comprising:

• a diverging portion which is a protruding portion with a conical shape, a truncated cone shape, a pyramid shape, a truncated pyramid shape, or a bowl shape oriented toward the light emitting element and provided on a surface on an opposite side of a light exit surface from which light is emitted from the light emitting element of the light guide plate, the diverging portion causing a luminous flux emitted from the light emitting element to diverge;
• and
• a restricting portion which is a reflective surface provided in a periphery of the light emitting element and which, when a prescribed range from the light emitting element on the light exit surface is defined as an illuminated area illuminated by the light emitting element, reflects light traveling from inside toward outside of the illuminated area to restrict traveling, toward a side of the light exit surface, of light traveling toward the outside of the illuminated area.