To provide a surface light emitting device having excellent withstand load and immersion proof, safety and maintenance capability, capable of emitting light from an entire light emitting surface, wherein a joint is not conspicuous when a plurality of light emitting surfaces are mutually joined.
This surface light emitting unit 1 wherein light from a light source device is guided by a light guiding cable 21B has a light emitting surface 1a and a light entering end face 131a. The light emitting end of the light guiding cable 21B is held by a fixing plate 17 and is disposed so as to adjacently face the light entering end face 131a. The light guiding plate 131 provided with the light entering end face 131a is stored in a body case 11 with a water blocking treatment applied. The surface light emitting unit 1 is provided with reflecting sheets 132, 133, a light diffusing sheet 134, an opaque plate 14 and a tempered glass plate 15. The water blocking treatment is carried out by applying water blocking agents SA2, SA3 to a chamfered part formed on the peripheral rim of the opaque plate 14 and the tempered glass plate 15.
SHIMONIIHARA YOSHIHIRO
UENO ATSUYASU
