It is an object of the present invention to provide a laser light source module capable of diverting current flowing to a laser diode when the laser diode does not emit light. A laser light source module includes a laser diode, a bypass circuit parallelly connected to the laser diode and diverting current flowing to a laser diode in an on state, a light detection circuit detecting laser light of the laser diode, and the bypass circuit switching circuit switching the bypass circuit to the on state in accordance with a control signal being input thereto, and the bypass circuit switching circuit can switch the bypass circuit to the on state in accordance with a state where the light detection circuit does not detect the laser light.