To stably generate sufficient negative ions inside a room from an emission electrode by smoothly leading charges generated in the periphery of a resin casing or lid body to a ground composed of a spring-like conductive piece.

In this air conditioner, the negative ions are emitted into the room from an ion generation part provided near a blow off part. In the ion generation part provided inside the resin casing of the air conditioner, the casing or the resin lid body 17 installed to the casing is formed with a large number of hole parts 19 each composed of a slit-like oblong hole or a circular small hole, the negative ion-generating emission electrode 20 is positioned opposite to the hole parts 19, at least the lid body 17 or the casing around the hole parts 19 is formed of an antistatic resin or an electroconductive resin, and the lid body 17 or the casing around the hole parts 19 is grounded.