MOUNTING STRUCTURE OF CAP

PROBLEM TO BE SOLVED: To provide a mounting structure of a cap that protects a specific site in a case and is opened and closed easily by a simple configuration. SOLUTION: A rectangular groove 11 is provided at the outer-surface side of a case 10 that is a plastic molding. An external connection terminal and first and second under cut sections 13 and 14 are provided at a site facing the groove. An external connection terminal 12 is exposed in the rectangular groove 11. A nib section 21 and a pair of elastic pieces 22, 23 are provided at one end and the other of the cap 20 made of the plastic molding, respectively. The nib section opposes the elastic pieces mutually, and at the same time the cap can slide on the opposite inner-periphery surface of the rectangular groove 11 freely. The tip of the nib section 21 is fitted to an undercut section 13 removably, and at the same time the tips of the elastic pieces 22, 23 are fitted to an undercut section 14 removably. The fitting is made by the elastic force of the elastic pieces. The elastic piece is formed in a U shape for giving elasticity, thus expanding and contracting in a cap sliding direction by the elastic deformation freely.