In a distortion compensating amplifier that compensates for distortion occurring in main amplifiers, a first amplifying unit amplifies, with a first main amplifier, a first signal consisting of a main signal to be amplified and detects distortion occurring in the first main amplifier, a distortion adjusting unit subjects the distortion detected by the first amplifying unit to vector adjustment, a second amplifying unit combines a second signal consisting of the main signal to be amplified and the distortion supplied from the distortion adjusting unit and amplifies a combined signal with a second main amplifier, and a combining unit combines an amplified signal supplied from the first amplifying unit and an amplified signal supplied from the second amplifying unit.