A USB connector comprises an insert-molded member formed by insert molding technology and a metal shell, wherein the insert-molded member includes an insulative housing and a plurality of conductive terminals. The terminal bearing portion of the insert-molded member extends outward a first side arm and a second side arm having a clipping groove on two sides thereof. The rear part of each conductive terminal has an arch portion, which defines an interfering portion connected with a circuit board. A circuit board can be inserted into the clipping grooves of the insert-molded member from the rear side of the connector, then the conductive terminals press against the circuit board tightly for the arch portion on the rear part thereof with its elasticity and achieve signal transmission by connecting the interfering portion thereof with the circuit board.