Provided are a power amplifier module and a communication device having reduced size. A power amplifier module (100) comprises a mounting substrate (200), a power amplifier (80), and an attenuating circuit (such as a first attenuating circuit 61) for attenuating harmonics of a signal output from the power amplifier (80). The attenuating circuit comprises a plurality of inductors (a first inductor 612, a second inductor 613) which are stacked inside the mounting substrate (200) and are connected to an output terminal (81) of the power amplifier (80). The plurality of inductors are disposed so as to overlap when the mounting substrate (200) is viewed in plan from a thickness direction (D1).