The present invention provides a power amplifier that can achieve high efficiency and downsizing. A power amplifier is provided with: a distributor which distributes a first signal between a second signal and a third signal that lags approximately 90 degrees behind the second signal; a first amplifier which, in a region where the power level of the first signal is higher than or equal to a first level, amplifies the second signal and outputs a fourth signal; a second amplifier which, in a region where the power level of the first signal is higher than or equal to a second level higher than the first level, amplifies the third signal and outputs a fifth signal; an output unit which outputs an amplified signal of the first signal on the basis of the fourth and fifth signals; first and second LC parallel resonance circuits which are series-connected between an output terminal of the first amplifier and an output terminal of the second amplifier; and a choke inductor having one end to which power supply voltage is supplied and the other end connected to a connection point of the first and second LC parallel resonance circuits. The resonance frequency of the first LC parallel resonance circuit is approximately an integral multiple of the frequency of the first signal, and the resonance frequency of the second LC parallel resonance circuit is approximately an integral multiple of the frequency of the first signal.