PROBLEM TO BE SOLVED: To provide a heat pump type air conditioning machine for a protected horticulture greenhouse, causing less disease damage of crops/plants, and raising high-quality crops/plants. SOLUTION: The heat pump type air conditioning machine for a protected horticulture greenhouse, allowing reheat dehumidification operation, includes a control device inputting information from each sensor, outputting a control signal to each equipment, and including a time function, a humidifying unit, and a selection means selecting cold (cooling) operation, reheat dehumidification operation, heating operation and humidification operation. COPYRIGHT: (C)2011,JPO&INPIT