The reflecting film 16 is formed on the end face 14, and formed by a method in which metals such as silver and aluminum are vapor deposited or these vapor deposited metals are attached to a PET (poly ethylene terephthalate) resin sheet. [0042] A material of the light transmission plate 1 includes a transparent resin such as an acrylic resin, a polycarbonate resin, and an amorphous polyolefin resin