A card holding member is able to hold a card 101 with terminal members and able to be inserted into a card connector. Here, the card holding member includes a frame portion 161 facing a side surface 112 of the card 101, and a movable lock portion provided on the frame portion 161 which is able to engage and disengage a lock portion of the card connector. The movable lock portion is disengaged from the lock portion by an auxiliary portion which activates the ejection mechanism for ejecting the card holding member from the card connector.