To provide a fuel supply device for a vehicular engine which achieves a fail safe of a fuel supply system even on a collision in which an air bag fails to operate.

An engine control unit stops a fuel pump when an air bag sensor unit detects a collision. A fuel system control unit detects a collision on the basis of a detection signal of a fuel level gauge or a tank internal pressure sensor. When detecting a collision, the control unit stops the fuel pump. The fuel pump is allowed to be driven by electric power supply only when both the engine control unit and the fuel system control unit determine no occurrence of a collision.