This invention relates to a card edge connector and a latch thereof. The connector is used to receive a printed circuit card and includes a housing having two opposite ends, a card slot disposed between two opposite ends. The housing has a first width. The latch as a latch body portion, pivotally mounted on two ends of the housing for ejecting the card, and at least one through hole and a second width. The latch further has a latch head portion, extending from the body portion for latching the card, having at least one through hole and a third width. The second and third widths are substantially the same, and are smaller than the first width of the housing for improving heat dissipation.