Abstract: An electrical plug connector includes an insulated housing, conductive terminals, and a metallic shell. The insulated housing includes a base portion and recessed portions configured at two sides of the base portion. The conductive terminals are held at the base portion. The metallic shell includes a body shell, two stopping pieces, two holding portions, and an extending sheet. The body shell encloses the base portion and defines two engaging grooves. The stopping pieces are protruded out of lateral inner surfaces of the body shell to engage with the recessed portions. The holding portions allow connections of portions of the body shell spaced by the engaging groove and hold two sides of the circuit board from moving. Engaging pieces of the extending sheet are engaged with the circuit board to prevent the circuit board from being detached from the insulated housing to prevent charging or data transmission failure.