A first casing and a second casing movably connected to the first casing are provided. PAs amplify a transmit signal. FET switches are provided between the ground and respective transmission paths connecting the PAs and an antenna. When an intermediate voltage is applied, the FET switch has a capacitance according to the applied intermediate voltage. An open or close detection unit acquires the impedance of the antenna corresponding to the positional relationship of the first casing and the second casing. A control unit turns one of a plurality of switches ON and applies the intermediate voltage to the FET switches to achieve a capacitance whereby the impedance of the PA arranged on the transmission path where the switch is ON and the impedance of the antenna are matched based on the impedance of the antenna acquired by the open or close detection unit.