A control method for controlling a series hybrid vehicle in which a drive motor and an internal combustion engine are supported in a vehicle body via a plurality of mount members in an integrated state, the method being one in which a controller: causes an electric power generation motor to generate electric power, the electric power generation motor being driven by motive power of the internal combustion engine; actuates the drive motor by using the generated electric power and drives drive wheels; and causes the drive motor to generate regenerative torque that corresponds to a deceleration request during deceleration, wherein the upper limit of the regenerative torque is restricted to a magnitude at which the engine rotational speed of the internal combustion engine during generation of electric power is higher than a floor vibration generation region established based on of the upper limit of the regenerative torque, said region being an engine rotational speed region in which resonance of a vehicle body floor is produced, such that the regenerative torque is generated by the drive motor.