Power amplifier device

A power amplifier device comprising:

• a semiconductor substrate;
• a plurality of first transistors provided on the semiconductor substrate and configured to receive an input of a radio-frequency signal;
• a plurality of second transistors provided on the semiconductor substrate, electrically connected to the respective plurality of first transistors, and configured to output a radio-frequency output signal obtained by amplifying the radio-frequency signal;
• a plurality of first bumps provided so as to overlay the respective plurality of first transistors and a second bump provided away from the plurality of first bumps and provided so as not to overlay the plurality of first transistors and the plurality of second transistors, wherein, when viewed in plan from a direction perpendicular to a surface of the semiconductor substrate, one of the first transistors and one of the first bumps, one of the second transistors, the second bump, another one of the second transistors and another one of the first transistors and another one of the first bumps are arranged in a linear sequential order.