To provide a door turning mechanism for an air-conditioner wherein the manufacturing cost is low, the arrangement space is small, and no working sounds are generated.

An air-conditioner door 30 including a turning shaft 38 which is turnably supported by an air feeding duct, and a constraining plate 31 which constrains the flow of air by locating in an air feeding passage is turned by this door turning mechanism. The door turning mechanism comprises: a first shape memory member 70 which is arranged between the turning shaft of the air feeding duct and a first eccentric section 62, and turns the air-conditioner door in one direction at the time of contraction; a second shape memory member 75 which is arranged between the turning shaft of the air feeding duct and a second eccentric section 63, and turns the air-conditioner door in the other direction at the time of contraction; and power feeding means 81, 88 and 89 which make the first shape memory member or the second shape memory member contract by feeding power.