<;P>;PROBLEM TO BE SOLVED: To provide a compact air conditioner having an air cleaning function. <;P>;SOLUTION: A discharge unit (30) and a heat exchanger (20) are mounted in an air passage (15). A rod-shaped discharge electrode (31) and a plate-shaped opposite electrode (32) are mounted along the heat exchanger (20) orthogonally to the air flow in the discharge unit (30). When voltages are applied to both the electrodes (31, 32), streamer discharge is generated between both the electrodes (31, 32), and an active species decomposing a treated component is produced. <;P>;COPYRIGHT: (C)2006,JPO&NCIPI