A dehumidifying system, comprising: a main body that includes an inlet port for sucking air from a dehumidification target space and an outlet port for supplying air to the dehumidification target space; an air passage provided in the main body, the air passage connecting the inlet port and the outlet port; a first moisture adsorption/desorption device disposed in the air passage and including an adsorbent for desorbing moisture to air with a low relative humidity, and for adsorbing moisture from air with a high relative humidity; a second moisture adsorption/desorption device disposed in the air passage and disposed so as to be spaced apart from the first moisture adsorption/desorption device, the second moisture adsorption/desorption device including an adsorbent for desorbing m oisture to air with a low relative humidity, and for adsorbing moisture from air with a high relative humidity; a cooling device disposed between the first moisture adsorption/desorption device and the second moisture adsorption/desorption device, the cooling device cooling air that has been humidified by desorption of moisture from the first moisture adsorption/desorption device or the second moisture adsorption/desorption device; and switching devices (40a, 40b) disposed in the air passage, the switching devices (40a, 40b) switching between a first path in which the air sucked from the inlet port passes through the first moisture adsorption/desorption device, the cooling device, and the second moisture adsorption/desorption device in this order, and a second path in which the air sucked from the inlet port passes through the second moisture adsorption/desorption device, the cooling device, and the first moisture adsorption/desorption device in this order, characterized in that the adsorbent provided for each of the first and second moisture adsorption/desorption devices (10c, 10d) has an equilibrium adsorption capacity with respect to air with a relative humi dity ranging from 40 to 100% increases in a substantially linear manner with respect to increase in the relative humidity, wherein the first moisture adsorption/desorption device, the cooling device and the second moisture adsorption/desorption device are disposed in series in the air flowing direction in the air passage so that sides through which air passes face each other, and the dehumidifying system is configured for carrying out desorption in such a way that during desorption, the air sucked from the inlet port flows into the first moisture adsorption/desorption device and the second moisture adsorption/desorption device without being heated to reduce relative humidity. a main body that includes an inlet port for sucking air from a dehumidification target space and an outlet port for supplying air to the dehumidification target space; an air passage provided in the main body, the air passage connecting the inlet port and the outlet port; a first moisture adsorption/desorption device disposed in the air passage and including an adsorbent for desorbing moisture to air with a low relative humidity, and for adsorbing moisture from air with a high relative humidity; a second moisture adsorption/desorption device disposed in the air passage and disposed so as to be spaced apart from the first moisture adsorption/desorption device, the second moisture adsorption/desorption device including an adsorbent for desorbing m oisture to air with a low relative humidity, and for adsorbing moisture from air with a high relative humidity; a cooling device disposed between the first moisture adsorption/desorption device and the second moisture adsorption/desorption device, the cooling device cooling air that has been humidified by desorption of moisture from the first moisture adsorption/desorption device or the second moisture adsorption/desorption device; and switching devices (40a, 40b) disposed in the air passage, the switching devices (40a, 40b) switching between a first path in which the air sucked from the inlet port passes through the first moisture adsorption/desorption device, the cooling device, and the second moisture adsorption/desorption device in this order, and a second path in which the air sucked from the inlet port passes through the second moisture adsorption/desorption device, the cooling device, and the first moisture adsorption/desorption device in this order, characterized in that the adsorbent provided for each of the first and second moisture adsorption/desorption devices (10c, 10d) has an equilibrium adsorption capacity with respect to air with a relative humi dity ranging from 40 to 100% increases in a substantially linear manner with respect to increase in the relative humidity, wherein the first moisture adsorption/desorption device, the cooling device and the second moisture adsorption/desorption device are disposed in series in the air flowing direction in the air passage so that sides through which air passes face each other, and the dehumidifying system is configured for carrying out desorption in such a way that during desorption, the air sucked from the inlet port flows into the first moisture adsorption/desorption device and the second moisture adsorption/desorption device without being heated to reduce relative humidity.