A clothes dryer, comprising: a drum providing an accommodating space for clothes; a heat pump cycle having a first evaporator, a compressor and a condenser, and configured to apply heat to air circulating back into the drum via the drum, the first evaporator and the condenser; and a blower configured to circulate the air, wherein the heat pump cycle comprises: second to nth evaporators disposed in series with the first evaporator within an air duct forming a circulation flow path of the air; an auxiliary heat exchanger (128, 231) connected to the condenser by a refrigerant pipe to cool refrigerant discharged from the condenser; first to nth expansion valves (125, 126) installed in first to nth branch pipes, respectively, and the first to nth branch pipes as part of the refrigerant pipe extending from the condenser to the first to nth expansion valves (125, 126), the first to nth expansion valves (125, 126) independently controlling flow rates of refrigerants flowing into the first to nth evaporators (121, 122), and a controller configured to control the compressor according to refrigerant discharge pressure of the compressor or refrigerant inlet pressure of the condenser, and to control the flow rate of the refrigerant by varying a frequency of the compressor, wherein the compressor is an inverter type compressor, wherein the clothes dryer is adapted to control the first to nth expansion valves (125, 126) by making an open degree of each of the second to nth expansion valves narrower than that of the first expansion valve, and wherein a flow rate of the refrigerant introduced into each of the second to nth evaporators is controlled to be smaller than a flow rate of the refrigerant introduced into the first evaporator. a drum providing an accommodating space for clothes; a heat pump cycle having a first evaporator, a compressor and a condenser, and configured to apply heat to air circulating back into the drum via the drum, the first evaporator and the condenser; and a blower configured to circulate the air, wherein the heat pump cycle comprises: second to nth evaporators disposed in series with the first evaporator within an air duct forming a circulation flow path of the air; an auxiliary heat exchanger (128, 231) connected to the condenser by a refrigerant pipe to cool refrigerant discharged from the condenser; first to nth expansion valves (125, 126) installed in first to nth branch pipes, respectively, and the first to nth branch pipes as part of the refrigerant pipe extending from the condenser to the first to nth expansion valves (125, 126), the first to nth expansion valves (125, 126) independently controlling flow rates of refrigerants flowing into the first to nth evaporators (121, 122), and a controller configured to control the compressor according to refrigerant discharge pressure of the compressor or refrigerant inlet pressure of the condenser, and to control the flow rate of the refrigerant by varying a frequency of the compressor, wherein the compressor is an inverter type compressor, wherein the clothes dryer is adapted to control the first to nth expansion valves (125, 126) by making an open degree of each of the second to nth expansion valves narrower than that of the first expansion valve, and wherein a flow rate of the refrigerant introduced into each of the second to nth evaporators is controlled to be smaller than a flow rate of the refrigerant introduced into the first evaporator. second to nth evaporators disposed in series with the first evaporator within an air duct forming a circulation flow path of the air; an auxiliary heat exchanger (128, 231) connected to the condenser by a refrigerant pipe to cool refrigerant discharged from the condenser; first to nth expansion valves (125, 126) installed in first to nth branch pipes, respectively, and the first to nth branch pipes as part of the refrigerant pipe extending from the condenser to the first to nth expansion valves (125, 126), the first to nth expansion valves (125, 126) independently controlling flow rates of refrigerants flowing into the first to nth evaporators (121, 122), and a controller configured to control the compressor according to refrigerant discharge pressure of the compressor or refrigerant inlet pressure of the condenser, and to control the flow rate of the refrigerant by varying a frequency of the compressor, wherein the compressor is an inverter type compressor, wherein the clothes dryer is adapted to control the first to nth expansion valves (125, 126) by making an open degree of each of the second to nth expansion valves narrower than that of the first expansion valve, and wherein a flow rate of the refrigerant introduced into each of the second to nth evaporators is controlled to be smaller than a flow rate of the refrigerant introduced into the first evaporator.