A panel light source device includes: a light guide plate 1; a reflecting
sheet 5, provided facing a rear face of the light guide plate 1, and
an end of which is bent, so as to face a side face of the light guide plate 1;
a wire 4 disposed at a side face of the light guide plate 1, sandwiching
the reflecting sheet 5 therebetween; and a slim case, wherein the slim case
is constructed of a rear face case 7, a front face of which is open, the
light guide plate 1, the reflecting sheet 5 and the wire 4 being
inserted into the case 7 through the front face thereof, and a front face
case 6 then being engaged with the rear face case 7. The rear face
case 7 has a reflecting sheet exposing section 14, formed so that
a height, of a portion of a side face on the wire side, is lower than the height
of a remaining portion of the side face, to thereby expose the reflecting sheet
5. Thus, the assembly of a panel light source device is made easy.
