To simplify a mounting structure of an ion generator capable of increasing the generation of negative ion by internally mounting a stylus discharge-type negative ion generator, being mounted inside of a vertical partitioning plate made out of a hard foamed synthetic resin to prevent the risk of contact by someone's finger, and preventing a side wall part of the partitioning plate from being charged.

This ion generator mounting structure for the integral air conditioner has a supporting hole longitudinally penetrated near a side part of the vertical partitioning plate made out of the hard foamed synthetic resin, and partitioning an indoor side and an outdoor side, a metallic protective member is mounted in a state of surrounding the side wall part of the vertical partitioning plate, a part of a back panel is kept into contact with a rear end of the ion generator inserted into the supporting hole, an inner end part of the metallic protective member is engaged with a front face part of the ion generator, and the metallic protective member is provided with an earth tape.