A universal serial bus connector includes an insulating housing, a plurality of terminals disposed to the insulating housing, a dielectric base, a first shielding shell surrounding the insulating housing, and a second shielding shell. Each of the terminals has a fastening portion, and a soldering portion slantwise extending upward and rearward from a rear end of the fastening portion to be exposed behind the insulating housing. The dielectric base disposed to a rear end of the insulating housing defines a plurality of rows of insertion slots and resisting surfaces exposed behind the insulating housing. The soldering portions are inserted into the insertion slots and abut against the resisting surfaces. The second shielding shell disposed to rear ends of the insulating housing and the first shielding shell includes a first main board and a second main board parallel with the soldering portions abutting against the resisting surfaces.