A desiccant air conditioner includes an intake path that introduces air SA from outdoors to indoors, an exhaust path that exhausts air RA from indoors to outdoors, a desiccant rotor adapted to perform dehumidification by adsorbing moisture in air SA flowing through the intake path and regenerate dehumidifying capacity by releasing moisture into air RA flowing through the exhaust path, heating heat exchangers that heat air RA in the exhaust path, and a sensible heat exchanger that performs heat exchange between air RA flowing through the intake path and air SA flowing through the exhaust path, wherein two dehumidification regions, the first dehumidification region and the second dehumidification region, through which air in the intake path passes and two regeneration regions, the first regeneration region and the second regeneration region, through which the air RA in the exhaust path passes are alternately formed in the desiccant rotor.