A cable connects a circuit board mounted with an electronic circuit to a BT module that controls wireless communications compliant with Bluetooth (Registered Trademark). The cable is a connection cable that elastically deforms and applies pushing force in a direction to make the BT module leave away from the circuit board. A second holding piece, which is cantilever-shaped, moves to a releasing position at which holding the BT module is released by elastic deformation as well as moves to a supporting position at which the second holding piece presses the BT module by release of elastic deformation.