The present invention relates to a USB connector, which comprises: a connector main body having plural open slots, plural first terminals and plural second terminals; and a substrate having plural first contact pads and plural second contact pads respectively exposed outside the substrate, and the plural first contact pads and the plural second contact pads are staggeringly arranged for being respectively coupled to the plural first terminals and the plural second terminals, thereby forming a USB connector. The USB connector allows a USB2.0 connector and a USB3.0 connector to be respectively inserted.