Abstract: In a casing body of an audio device that includes a main body and a front surface panel formed to protrude outside from an upper surface and side surfaces of the main body and has having a sharp edge formed at the corner part of the rear end face of the front surface panel, a small boss is formed inside the sharp edge. When a finger touches the sharp edge, a force concentrated on a point of the sharp edge is dispersed to two points of the sharp edge and the boss due to the action of the boss. Accordingly, even when the user's finger touches the sharp edge, a fear that the finger is injured is decreased. Since the boss is provided inside the sharp edge, an external appearance employing the sharp edge can be maintained in view of its design.