A wireless communication module that is connected to a main-body communication module through a signal transfer cable, the wireless communication module comprising: a radio-frequency terminal to which the signal transfer cable is connected, a transmission signal being entered to the radio-frequency terminal; a directional coupling circuit, an input port of which is connected to the radio-frequency terminal; a first switch circuit that has a common terminal, a first connection terminal, and a second connection terminal, the common terminal being connected to an output port of a signal transfer path in the directional coupling circuit; a first transmission circuit connected to the first connection terminal; a second transmission circuit connected to the second connection terminal; and a power detecting circuit connected to a coupling output port of the directional coupling circuit, wherein the first transmission circuit is configured to transmit a signal in a prescribed first frequency band, and the second transmission circuit is configured to transmit a signal in a second frequency band, which differs from the prescribed first frequency band, a magnitude of electric power of the transmission signal at the input port of the directional coupling circuit is constant regardless of a frequency of the transmission signal, and a difference is made in an amount of electric power attenuation in the path from the input port of the directional coupling circuit to the input port of the power detecting circuit between the first frequency band and the second frequency band, and the first switch circuit is configured to be switched to the first connection terminal or the second connection terminal according to a magnitude of electric power detected by the power detecting circuit. a radio-frequency terminal to which the signal transfer cable is connected, a transmission signal being entered to the radio-frequency terminal; a directional coupling circuit, an input port of which is connected to the radio-frequency terminal; a first switch circuit that has a common terminal, a first connection terminal, and a second connection terminal, the common terminal being connected to an output port of a signal transfer path in the directional coupling circuit; a first transmission circuit connected to the first connection terminal; a second transmission circuit connected to the second connection terminal; and a power detecting circuit connected to a coupling output port of the directional coupling circuit, wherein the first transmission circuit is configured to transmit a signal in a prescribed first frequency band, and the second transmission circuit is configured to transmit a signal in a second frequency band, which differs from the prescribed first frequency band, a magnitude of electric power of the transmission signal at the input port of the directional coupling circuit is constant regardless of a frequency of the transmission signal, and a difference is made in an amount of electric power attenuation in the path from the input port of the directional coupling circuit to the input port of the power detecting circuit between the first frequency band and the second frequency band, and the first switch circuit is configured to be switched to the first connection terminal or the second connection terminal according to a magnitude of electric power detected by the power detecting circuit.