A card connector includes an insulating body defining at least one receiving cavity for receiving an electronic card, electrical terminals disposed in the insulating body and projecting into the receiving cavity for contacting with the electronic card, and a securing part. One wall of the receiving cavity is opened with a slot and a ring-shaped receiving groove communicated with the slot and penetrating through the wall to communicate with the receiving cavity. A pillar is formed in the receiving groove. The securing part has a semi-ring elastic portion sleeved round the pillar and located in the receiving groove, and a pair of positioning arms parallelly extending from free ends of the elastic portion to be inserted in the slot and elastically abut against two inner sidewalls of the slot. The elastic portion projects into the receiving cavity for elastically resisting against one side edge of the electronic card.