A configuration is provided with: a tuned line 13 that is connected between a branch terminal 3 and a branch terminal of branch lines 2 and 4; and a tuned line 14 that is connected between a combining terminal 7 and a combining terminal 9 of combining lines 10 and 11. This enables reduction of a non-uniform voltage distribution occurring due to a difference in characteristics between two amplifier elements 6 and 8.