An air conditioner for an automotive vehicle having a water-cooling type internal combustion engine includes: a first refrigerator; and an adsorption type refrigerator having adsorbent. The first refrigerator controls temperature of air to be blown into a passenger compartment of the vehicle. The adsorbent generates adsorption heat when the adsorbent adsorbs the medium, and desorbs the adsorbed medium when the adsorbent is heated by coolant water in the internal combustion engine. The air to be blown into the passenger compartment is heated by the adsorption heat of the adsorbent, and is cooled by evaporation latent heat of the medium.