A card edge connector for mating with an electronic card includes an elongated housing (1), a number of contacts retained to the housing (1), and a retainer (2) at one end of the housing (1). The housing (1) has a pair of opposed side walls (11), a central slot (12) between the side walls and a fitting section at one end thereof. The fitting section defines a pair of axes holes (145). The retainer (2) has a base portion (21) with a pair of pivots (211) engaging with the axes holes (145), a latch projection (22) inwardly extending from the base portion for locking the electronic card, a flexible arm (23) unitarily extending from the base portion (21) to resist an inner wall of the fitting section for fastening the retainer (2) to the housing (1).