A power amplifier MMIC has a first stage amplifier circuit having a transistor and matching circuits provided on input and output sides of the transistor; a plurality of final stage transistors connected in parallel; a first line connected between adjacent gates of the plurality of final stage amplifiers; a second line, connected between adjacent drains of the plurality of final stage amplifiers, for correcting an input signal phase shift caused by the presence of the first line; and an output matching circuit connected to one of connection points between the second line and the drains, and wherein an output of the first stage amplifier circuit is coupled to one gate of a final stage transistor whose drain is not connected to the output matching circuit, and the first stage amplifier circuit and the plurality of final stage transistors are arranged longitudinally alongside each other.