To automatically detect the flaw of the sign panel of a card.

An inspection device has a light source (4) for irradiating a card (1). The sign panel (2) having a rough surface (2a) is formed on a smooth surface (1a), with light from an oblique direction, a camera (5) receiving the reflected light from the surface (2a) of the sign panel part (2) above the sign panel part (2) and an image processing part (6) for detecting a place where the receiving quantity of light is little as the flaw part (3) of the sign panel part (2).