A length of a zone in which a power propagation direction from an input/output terminal (P251) toward a common terminal (P20) and a power propagation direction from the common terminal (P20) toward an external connection terminal (P10) are opposite to each other is longer than a length of a zone in which a power propagation direction from an input/output terminal (P211) toward the common terminal (P20) and a power propagation direction from the common terminal (P20) toward the external connection terminal (P10) are opposite to each other. A FET (251) and a FET (211) have structures that power transferred between a drain and a source of the FET (251) in accordance with predetermined input power is greater than power transferred between a drain and a source of the FET (211).