The present invention relates to a general-purpose dehumidifying apparatus in which a housing having a dehumidifying member therein is applied to an object to be dehumidified (an electric light (such as a street lamp, a vehicle lamp, etc.), an outdoor or indoor electronic enclosure (such as power distributing equipment, communication equipment, security equipment, a solar system, etc.), and the like), and the dehumidifying apparatus removes internal moisture through an outer valve that opens and closes an outer communicating part of the housing (by closing the outer valve) in a case where the temperature of the object to be dehumidified is low and discharges the moisture of the dehumidifying member to the outside by opening the outer valve when the temperature in a lamp module rises in a case where the temperature of the object to be dehumidified is high. The dehumidifying apparatus, according to the present invention, comprises: a housing installed in an object to be dehumidified and having inner and outer communicating parts connected to the outside; a dehumidifying member mounted in the housing; and an outer valve that opens and closes the outer communicating part of the housing.