A high-frequency-signal switching circuit (1) includes a first high-frequency-signal path (2) which includes a high-frequency amplifier stage (2), a first diode (22) connected in series to the input end of the high-frequency amplifier stage, and a second diode (23) connected in series to the output end of the high-frequency amplifier stage; a second high-frequency-signal path (3) formed of a third diode (31) connected in parallel to the first high-frequency-signal path; and a switching-voltage supply section (8) for switching the high-frequency amplifier stage between an operation state and an non-operation state, and for switching the first to third diodes between an ON state and an OFF state. When the switching voltage of the switching-voltage supply section has a first polarity, the high-frequency amplifier stage is in the operation state, the first and second diodes are in the ON state, and the third diode is in the OFF state, so that a high-frequency signal is transferred through the first high-frequency-signal path, and when the switching voltage of the switching-voltage supply section has a second polarity, the high-frequency amplifier stage is in an non-operation state, the first and second diodes are in the OFF state, and the third diode is in the ON state, so that a high-frequency signal is transferred through the second high-frequency-signal path.
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