An air-conditioning machine having, in blocks within the same box body, an indoor-air circulation wind passage, an outdoor-air circulation wind passage, and a ventilation wind passage. An opposite-flow heat exchanger, designed to recover the heat in the ventilation wind passage, is provided. One of two opposite faces having two wind passage openings in one face of the opposite-flow heat exchanger faces the outdoor-air circulation wind passage. The other thereof faces the indoor-air circulation wind passage. Shutters or dampers are provided on both of the faces. Functions of cooling and heating, heating and exchange ventilation, and simultaneous feed and exhaust non-heat-exchange ventilation can be exhibited.