To provide a branch unit for an air-conditioner capable of connecting either the indoor machine of a multi-type air-conditioner or the outdoor machine of a pair type air-conditioner to one or a plurality of indoor machines selected from the indoor machine of the multi-type air-conditioner or the indoor machine of the pair-type air-conditioner.

The branch unit 300 is formed that a branch passage to branch refrigerant piping is constituted between a liquid pipe connection port 301 on the outdoor side and a plurality of liquid pipe connection ports 302 on the indoor side. The branch unit is provided with an electric motor operated valve 305 to reduce a refrigerant pressure passing through an internal part and a liquid pipe thermistor 306 to detect the temperature of refrigerant passing through the internal part are respectively situated in the branch passage.