TWI821921B

Provided is an invention (1) with which it is possible to efficiently select between air purity operation and dehumidification operation. This dehumidifier (1) has: a first air passage that is formed inside a housing (3), the first air passage being such that an airflow passes through an air purification means to reach a dehumidification means; a second air passage that is formed inside the housing (3), the second air passage being such that the airflow reaches the dehumidification means without passing through the air purification means; an airflow restriction means (51) for restricting the flow of the airflow in the second air passage; a compressor (6) for supplying a refrigerant to the dehumidification means; and a control device (18) for controlling a ventilation means, the airflow restriction means (51), and the compressor (6). The control device (18) controls the airflow restriction means (51) in accordance with environmental information and/or surroundings information.