An air conditioner comprising: a pipe in which a refrigerant flows; a first heat exchanger; a first compressor that is driven by electric power; a first-second heat exchanger; a second-second heat exchanger; a second compressor that is driven by a non-electric driving source; a fan; a third heat exchanger; a valve that is disposed in the pipe; and a controller, wherein the first heat exchanger and the first compressor constitute an electrically driven outdoor unit, the first-second heat exchanger, the second-second heat exchanger and the second compressor constitute a non-electrically driven outdoor unit, and the third heat exchanger constitutes an indoor unit, wherein the first heat exchanger, the first compressor and the third heat exchanger are present in a first passage, the second compressor and the third heat exchanger are present in a second passage, the second passage includes a first portion and a second portion, the second passage branching to a first branch passage and a second branch passage at the first portion, the first branch passage and the second branch passage being combined with each other at the second portion, the first-second heat exchanger is present in the first branch passage, the second-second heat exchanger is present in the second branch passage, the first-second heat exchanger, the second compressor, the first heat exchanger and the third heat exchanger are present in a third passage, and the third passage includes a connection passage that connects a point in the second branch passage with a point in the first passage, characterised in that the air conditioner further comprises a radiator that cools the non-electric driving source, wherein the fan blows air from the second-second heat exchanger toward the radiator, the second-second heat exchanger is positioned upstream the radiator in the airflow, the valve includes a first valve that is positioned in the connection passage, and the controller is configured to control the valve to select one passage of the pipe, in which the refrigerant flows, from the group consisting of the first passage, the second passage and the third passage, further to open the first valve to select the third passage, and to select the third passage when the first compressor is stopped and the second compressor is operated. a pipe in which a refrigerant flows; a first heat exchanger; a first compressor that is driven by electric power; a first-second heat exchanger; a second-second heat exchanger; a second compressor that is driven by a non-electric driving source; a fan; a third heat exchanger; a valve that is disposed in the pipe; and a controller, wherein the first heat exchanger and the first compressor constitute an electrically driven outdoor unit, the first-second heat exchanger, the second-second heat exchanger and the second compressor constitute a non-electrically driven outdoor unit, and the third heat exchanger constitutes an indoor unit, wherein the first heat exchanger, the first compressor and the third heat exchanger are present in a first passage, the second compressor and the third heat exchanger are present in a second passage, the second passage includes a first portion and a second portion, the second passage branching to a first branch passage and a second branch passage at the first portion, the first branch passage and the second branch passage being combined with each other at the second portion, the first-second heat exchanger is present in the first branch passage, the second-second heat exchanger is present in the second branch passage, the first-second heat exchanger, the second compressor, the first heat exchanger and the third heat exchanger are present in a third passage, and the third passage includes a connection passage that connects a point in the second branch passage with a point in the first passage, characterised in that the air conditioner further comprises a radiator that cools the non-electric driving source, wherein the fan blows air from the second-second heat exchanger toward the radiator, the second-second heat exchanger is positioned upstream the radiator in the airflow, the valve includes a first valve that is positioned in the connection passage, and the controller is configured to control the valve to select one passage of the pipe, in which the refrigerant flows, from the group consisting of the first passage, the second passage and the third passage, further to open the first valve to select the third passage, and to select the third passage when the first compressor is stopped and the second compressor is operated.