| abstract |
(57) [Problem] To provide a light guide plate for a planar light source made of a hydrogenated styrene copolymer having excellent optical properties, heat resistance, mechanical strength, and moldability, and having low moisture absorption. SOLUTION: The content of the hydrogenated styrene polymerized unit is 70% by weight or more and 97% by weight or less, and the melt viscosity (3 A light guide plate for a planar light source, comprising a hydrogenated styrene copolymer having a shear rate at 100 ° C. and a melt rate at a shear rate of 10 3 s −1, which is 30 Pa · s or more and 150 Pa · s or less. |