Board edge connector

A board edge connector is provided. The board edge connector includes an insulating housing, a plurality of terminals and a metal keycap. The insulating housing includes a board edge slot and at least one key integrally configured in the board edge slot. The key includes a top portion and two surfaces opposite to each other. A plate body receiving portion is provided alongside each of the two surfaces of the key. The plate body receiving portion includes a holding recess. The metal keycap includes plate bodies respectively received in the two-plate body receiving portions and an elastic holding arm positioned on at least one side of the plate body. The elastic holding arm latches to the holding recess of the plate body receiving portion. Therefore, the metal keycap can protect and prevent the key from being damaged or generating debris due to hit.