A power amplifier circuit includes a first transistor having a base to which a radio frequency (RF) signal is supplied and a collector to which a variable power-supply voltage corresponding to a level of the RF signal is supplied, and being configured to amplify the RF signal; a bias circuit including a second transistor configured to supply a bias current to the base of the first transistor; and an adjustment circuit configured to cause the bias current to be supplied to the base of the first transistor to decrease with decrease in the variable power-supply voltage by causing a current to be supplied to a base of the second transistor to decrease.