A humidity control apparatus having a humidifying part for humidifying air and a dehumidifying part for dehumidifying air inside a housing, and for controlling a humidity of a humidity control space by means of the humidifying part and the dehumidifying part, a circulation space provided outside the humidity control space within the housing, wherein the dehumidifying part has a dehumidifying part internal housing disposed within the circulation space inside the housing and a dehumidifying part external housing disposed outside the housing, and comprises: at least one main body part(s) that is configured to encapsulate a working fluid therein and to cause a heat-pipe phenomenon; a heat-insulating part formed as a plate and fitted externally to the at least one main body part(s) wherein the heat-insulating part is disposed between the dehumidifying part internal housing and the dehumidifying part external housing; and at least one heat absorption part(s); the heat-insulating part being provided with at least one through hole(s) and separating a dehumidifying space in the dehumidifying part internal housing from a heat release space in the dehumidifying part external housing, and wherein each of the at least one main body part(s) is inserted into a respective one of said at least one through-hole(s) of the heat-insulating part; wherein each heat absorption part is configured by a heat absorption part of a peltier element and configured to absorb heat from a respective base side part located on one side of the respective main body part in relation to the heat-insulating part and thereby to condense the working fluid that is evaporated into gas in the respective front side part located on the other side of the respective main body part in relation to the heat-insulating part, the front side part(s) being disposed within the dehumidifying space, the base side part(s) being disposed within the heat release space, and wherein the dehumidifying part dehumidifies the air by means of condensation of moisture contained in air coming into contact with the front side part (s) of the main body part (s) in the dehumidifying space and where the working fluid in liquid form in the front side part (s) evaporates. at least one main body part(s) that is configured to encapsulate a working fluid therein and to cause a heat-pipe phenomenon; a heat-insulating part formed as a plate and fitted externally to the at least one main body part(s) wherein the heat-insulating part is disposed between the dehumidifying part internal housing and the dehumidifying part external housing; and at least one heat absorption part(s); the heat-insulating part being provided with at least one through hole(s) and separating a dehumidifying space in the dehumidifying part internal housing from a heat release space in the dehumidifying part external housing, and wherein each of the at least one main body part(s) is inserted into a respective one of said at least one through-hole(s) of the heat-insulating part; wherein each heat absorption part is configured by a heat absorption part of a peltier element and configured to absorb heat from a respective base side part located on one side of the respective main body part in relation to the heat-insulating part and thereby to condense the working fluid that is evaporated into gas in the respective front side part located on the other side of the respective main body part in relation to the heat-insulating part, the front side part(s) being disposed within the dehumidifying space, the base side part(s) being disposed within the heat release space, and wherein the dehumidifying part dehumidifies the air by means of condensation of moisture contained in air coming into contact with the front side part (s) of the main body part (s) in the dehumidifying space and where the working fluid in liquid form in the front side part (s) evaporates.