To provide, at a low cost, a light leakage prevention device of an electronic apparatus capable of preventing light from leaking out of the circumference of an operation member to degrade quality in terms of appearance.

By forming inclined surfaces 29a and 29b directed toward inner peripheries of operation members 5 and 6 as they approach the inner side of an operation panel 2 in the insides of groove parts 31, 30 and 32 of facing members 28 for inserting side plate parts 22 and 23 of the operation member 5 and 6 therein, light leaking inward out of tip surfaces 25 and 26 of the side plate parts 22 and 23 in lighting a light source 35 can be reflected toward the inner periphery sides of the operation members 5 and 6. Thereby, light is prevented from leaking out of spaces 27a, 27b and 27c to the circumferences of the operation members 5 and 6, whereby quality is prevented from being degraded.