To provide a power amplifier circuit, which is capable of amplifying a signal having envelope variation with high power added efficiency, and exhibits low power consumption and high versatility, as well as to provide a transmitter and a wireless communication device using the power amplifier circuit, the power amplifier circuit includes: a constant envelope signal generation circuit (20) for converting an input signal (Si) having envelope variation into two constant envelope signals (Sd1, Sd2); a first and a second amplifiers (11, 12) for amplifying the two constant envelope signals to output two amplified signals (Sh1, Sh2); and an output adder (13) for performing vector addition of the two amplified signals. Further, the power amplifier circuit includes: a power distributor (23) for generating two fundamental signals (Sa1, Sa2) and a fundamental signal for conversion (Sb) from the input signal (Si); and a converted signal generation circuit (30) for generating two converted signals (Sc1, Sc2) from the fundamental signal for conversion, and performs vector addition of the two fundamental signals and the two converted signals to output the two constant envelope signals (Sd1, Sd2).