A humidity control module for humidifying or dehumidifying air using liquid absorbent, the module comprising: a partition member wholly or partially formed by a moisture permeable membrane not allowing the liquid absorbent to permeate but allowing water vapor to permeate, the partition member separating an air passage through which the air flows, from an absorbent passage through which the liquid absorbent flows; and a heat transfer member forming a heat medium passage through which a heat medium for heating or cooling flows, and disposed in the absorbent passage to allow the liquid absorbent flowing around the heat transfer member to exchange heat with the heat medium, characterized in that in the partition member, the moisture permeable membrane includes a plurality of plane-like moisture permeable membranes arranged at predetermined intervals to face one another, the air passage and the absorbent passage includes a plurality of air passages, and a plurality of absorbent passages, respectively, and the air passages and the absorbent passages are alternately formed along alignment of the moisture permeable membranes, wherein the heat transfer member includes a plurality of heat transfer tubes disposed between a pair of the moisture permeable membranes, which are adjacent with the absorbent passage interposed therebetween, the heat medium flowing through the heat transfer tubes, a first header connected to one end of each of the heat transfer tubes, and a second header connected to another end of each of the heat transfer tubes, and wherein the heat transfer tubes and the first and second headers (71, 72) of the heat transfer member are disposed in the absorbent passage. a partition member wholly or partially formed by a moisture permeable membrane not allowing the liquid absorbent to permeate but allowing water vapor to permeate, the partition member separating an air passage through which the air flows, from an absorbent passage through which the liquid absorbent flows; and a heat transfer member forming a heat medium passage through which a heat medium for heating or cooling flows, and disposed in the absorbent passage to allow the liquid absorbent flowing around the heat transfer member to exchange heat with the heat medium, characterized in that in the partition member, the moisture permeable membrane includes a plurality of plane-like moisture permeable membranes arranged at predetermined intervals to face one another, the air passage and the absorbent passage includes a plurality of air passages, and a plurality of absorbent passages, respectively, and the air passages and the absorbent passages are alternately formed along alignment of the moisture permeable membranes, wherein the heat transfer member includes a plurality of heat transfer tubes disposed between a pair of the moisture permeable membranes, which are adjacent with the absorbent passage interposed therebetween, the heat medium flowing through the heat transfer tubes, a first header connected to one end of each of the heat transfer tubes, and a second header connected to another end of each of the heat transfer tubes, and a plurality of heat transfer tubes disposed between a pair of the moisture permeable membranes, which are adjacent with the absorbent passage interposed therebetween, the heat medium flowing through the heat transfer tubes, a first header connected to one end of each of the heat transfer tubes, and a second header connected to another end of each of the heat transfer tubes, and wherein the heat transfer tubes and the first and second headers (71, 72) of the heat transfer member are disposed in the absorbent passage.