POWER AMPLIFIER

PROBLEM TO BE SOLVED: To provide a power amplifier that implements a stable amplifier operation.SOLUTION: The power amplifier includes: a plurality of parallel-connected transistors 15 formed on a semiconductor element 23 to amplify a high frequency signal input into an input terminal 11 in the process of output to an output terminal 12; a plurality of first gate bias resistances 20 formed on the semiconductor element 23 and in the neighborhood of at least the transistors 15 of the plurality of transistors 15 which are located in center and end portions of the semiconductor element 23, connected at one end to gate terminals of the corresponding neighboring transistors 15, and having a resistance value changing with temperature; and second gate bias resistances 21 connected at one end to the first gate bias resistances 20 and grounded at the other end.