A card holding member is provided which is able to hold a card having terminal members and which is able to be inserted into a card connector. The card holding member includes a frame portion, side frame portions, and a movable lock portion. The frame portion includes a front frame portion positioned forward in the insertion direction of the card holding member into the card connector. The side frame portions are connected at both ends to the front frame portion. The movable lock portion is positioned on a side frame portion and is able to engage and disengage from a lock portion on the card connector. The movable lock portion receives force from the lock portion of the card connector forward in the insertion direction when engaging the lock portion of the card connector.