There is provided a CPAP device in which an outflow sound of air is reduced while size reduction/weight reduction is maintained. The CPAP device includes a blower unit 10 which houses a turbofan 50 to draw in air and sends out the air and in which an air outflow opening to allow the air sent out from the turbofan 50 to flow out is formed, and a silencer 60 which is attached to one end of a hose 70 to feed the air flowing out from the air outflow opening to a mask 200 attached to a patient, is attachably and detachably attached to the air outflow opening of the blower unit 10 and reduces the outflow sound of the air flowing out from the air outflow opening, and the silencer 60 includes a regulating plate 69.
