An engine control device for a vehicle applied to a vehicle that includes a mechanical centrifugal clutch (C) for connecting and disconnecting driving force to be transmitted from an engine (E) to a driving wheel (WR), wherein the vehicle includes a throttle operator configured to adjust output power of the engine (E), a motor configured to rotate a crankshaft of the engine (E), and a control unit configured to control the motor and a fuel injection system , and the control unit executes injection stopping control for stopping fuel injection during deceleration of the vehicle and executes acceleration assist control for rotating the crankshaft with the motor from the state where the motor assist with the motor is off when an opening operation of the throttle operator is performed after an engine speed (Ne) becomes equal to or lower than a centrifugal clutch disconnection speed (Ne3) at which the centrifugal clutch (C) is disconnected and when the engine speed (Ne) is within the range of the idle speed (Ne1) or more, wherein when the engine speed (Ne) decreases to an injection restart speed (Ne2) that is lower than the centrifugal clutch disconnection speed (Ne3) after fuel injection by the injection stopping control stops, the control unit causes the fuel injection to be restarted, wherein the injection restart speed (Ne2) at which the fuel injection is to be restarted is set higher than an idle speed (Ne1), and the control unit causes the fuel injection to be restarted when the opening operation of the throttle operator is performed within a period after the engine speed (Ne) becomes equal to or lower than the centrifugal clutch disconnection speed (Ne3) until the engine speed (Ne) decreases to the injection restart speed (Ne2). the vehicle includes a throttle operator configured to adjust output power of the engine (E), a motor configured to rotate a crankshaft of the engine (E), and a control unit configured to control the motor and a fuel injection system , and the control unit executes injection stopping control for stopping fuel injection during deceleration of the vehicle and executes acceleration assist control for rotating the crankshaft with the motor from the state where the motor assist with the motor is off when an opening operation of the throttle operator is performed after an engine speed (Ne) becomes equal to or lower than a centrifugal clutch disconnection speed (Ne3) at which the centrifugal clutch (C) is disconnected and when the engine speed (Ne) is within the range of the idle speed (Ne1) or more, wherein when the engine speed (Ne) decreases to an injection restart speed (Ne2) that is lower than the centrifugal clutch disconnection speed (Ne3) after fuel injection by the injection stopping control stops, the control unit causes the fuel injection to be restarted, wherein the injection restart speed (Ne2) at which the fuel injection is to be restarted is set higher than an idle speed (Ne1), and the control unit causes the fuel injection to be restarted when the opening operation of the throttle operator is performed within a period after the engine speed (Ne) becomes equal to or lower than the centrifugal clutch disconnection speed (Ne3) until the engine speed (Ne) decreases to the injection restart speed (Ne2). <EOS>