Planar light unit

A planar light unit comprising:

• a light guide plate comprising:
• a light incident portion on a side edge of the light guide plate;
• and
• a light exit surface on a top surface of the light guide plate;
• a semiconductor light-emitting device configured to emit light into an inside of the light guide plate through the light incident portion;
• a light source board on which the semiconductor light-emitting device is mounted;
• and
• a flexible resin having a light-transmitting property and deformable flexibility,
• wherein the light incident portion has a recess formed therein that is bored in parallel with the top surface of the light guide plate, and a light incident surface at a bottom of the recess,
• wherein the recess formed in the light incident portion of the light guide plate has an approximately rectangular cross-section with a tapered shape that is wider at an entrance of the recess, and is configured to receive the flexible resin,
• wherein the semiconductor light-emitting device mounted on the light source board is configured to be pressed against the flexible resin toward the recess,
• wherein the flexible resin is configured to be compressed and flexibly deformed from an original prismatic shape so as to fit a shape of the recess,
• wherein the semiconductor light-emitting device and the light guide plate are in substantially complete contact with each other through the flexible resin, and
• wherein a reflecting-shaped portion is formed on at least one side among a top side and a bottom side of the light incident portion of the light guide plate.