A cellular-phone case having a retractable card holding structure, intended to hold a card in such a way that the card is put into or taken out from the case. The cellular-phone case includes a case body and a card holding means. The case body has a seating space to allow a cellular phone to be seated therein, with an outlet formed at a predetermined position on a back portion of the case body in such a way as to communicate with the seating space. The card holding means includes a support panel fitted into the outlet, the card being disposed on the support panel, and an actuating body provided on a side of the support panel so as to be locked to the outlet. The outlet is provided in the case body, and the card holding means is provided to move into and out of the outlet.