Provided is a flow path switching unit of a dryer configured to dry a drying material. The flow path switching unit includes a body portion, and a flow path guide dividing an internal space of the body portion to selectively form one of a first flow path of air for drying the drying material and a second flow path of air for dehumidifying outside air, according to an arrangement position of the body portion, and at a first position, the path switching unit provides the first flow path to guide air from a drum of the dryer toward a heat exchanger of the dryer, and at a second position, the path switching unit provides the second flow path to guide the outside air introduced from an outside of the dryer.