Method for manufacturing planar light source, planar light source, and light source

A method for manufacturing a planar light source, the method comprising:

• preparing a structure body including
• a wiring substrate,
• a light guide plate arranged over the wiring substrate, the light guide plate including a first major surface, a second major surface facing toward the wiring substrate at a side opposite to the first major surface, and an inner side surface defining a first hole extending from the first major surface to the second major surface with an opening on a first major surface side, and
• a light source arranged on the wiring substrate in the first hole, the light source including
• a light-emitting element including an
• element upper surface, an
• element lower surface, and an
• element side surface between the
• element upper surface and the
• element lower surface, and
• a first light-transmitting member covering the element side surface and the element upper surface, the first light transmitting member including a first side surface and a protrusion, the protrusion including a second side surface protruding from the first side surface toward the inner side surface of the light guide plate;
• injecting a first resin material downward through the opening of the first hole of the structure body, the first resin material including a light-diffusing agent;
• and
• curing the first resin material to form a first resin layer on the wiring substrate between the inner side surface of the light guide plate and the first side surface of the first light-transmitting member.