A dehumidifier according to an aspect of the present disclosure includes: a body; and a water container mounted at an upper side of the body, wherein the body includes a seating part arranged at an upper side thereof and on which the water container is seated and a hollow connection port protruding upward from the seating part, and the water container includes a connection hole into which the connection port is inserted and a valve which opens the connection hole as the water container is mounted on the body. The dehumidifier prevents condensed water in the water container from leaking through the connection hole in a state in which the water container is separated from the body.