A card edge connector for use with an electronic card, comprises an elongated housing having a pair of opposed side walls along a lengthwise direction, a central slot between the side walls, a tower portion upwardly extending at one end thereof. The central slot extends into the tower portion along the lengthwise direction to define a trench for receiving a side edge of the electronic card. A latch mechanism is retained in the tower portion, and has a locking projection protruding into the trench to lock with the electronic card.