FIG. 4A is a plan view showing the internal construction of a portion including a connector 2 and other members of an IC card in accordance with this embodiment, and FIG. 4B is a cross-sectional view taken along the line 6B--6B of FIG. 4A. In this embodiment, hooks 21 are disposed on side surfaces of the connector 2 on the opposite sides of an axis along card insertion direction.