An in-ceiling embedded type air conditioner including an indoor unit having an air blower and an indoor heat exchanger accommodated in a housing a substantially box-shape, and a filtering unit including a gas-liquid contact member that is disposed at the downstream side of the indoor heat exchanger on an air blowing passage through which air sucked by the air blower flows in the indoor unit and infiltrated with electrolytic water generated by electrolyzing water, the air and the electrolytic water being brought into contact with each other in the gas-liquid contact member, whereby the air cooled or heated in the indoor heat exchanger is filtered, that is, virus, etc. contained in the air is inactivated, sterilized or the like and then blown out to a room to be air-conditioned.