An electronic device includes a housing, and a card holding mechanism for holding an electronic card. The housing defines a through hole, and the card holding mechanism may be inserted into the housing via the through hole. The card holding mechanism includes a tray for receiving the electronic card, an operating component, and a transmission component. The operating component moves from a latched position to an unlatched position, the transmission component is driven by the operating component to rotate and drive the tray to eject from the housing.