A dehumidifier has a main body and a main tank. The main body has a secondary tank, a pump, and a retracting mechanism. A conduit portion of the retracting mechanism is mounted through and into the main tank, so the pump can draw water from the secondary tank and into the main tank. The main tank is mounted beside the main body and can be drawn upward to separate from the main body. The main tank has a first inclined surface. When the main tank is moved upward, the first inclined surface pushes the retracting mechanism, so the conduit portion retracts and is moved away from a moving path of the main tank when the main tank is being drawn upward. With the main tank mounted beside the main body, the main tank facilitates water pouring.