Abstract: Disclosed is a USB adapter for a vehicle that can effectively dissipate heat generated during power supply and data transmission. The USB adapter includes a casing installed at a center fascia or a console box of the vehicle, wherein one surface of the casing is open; a printed circuit board received inside the casing, wherein a USB port is mounted at one end of the printed circuit board and a receptacle is mounted at the other end of the printed circuit board; and a heat dissipation member configured to transfer heat generated during power supply and data transmission to the casing, such that the casing dissipates the heat out of the USB adapter.