Provided is a CPAP device that is kept small and lightweight and that also reduces air outflow noise. The present invention comprises: a blowing unit (10) into which is built a turbo fan (50) that draws in and sends out air, and in which is formed an air outflow port that outputs the air that is sent out from the turbo fan (50); and a silencer (60) that is removably mounted at the air outflow port of the blowing unit (10), that is also mounted to one end of a hose (70) that delivers to a mask (200) that is mounted on a patient the air that flows out of the air outflow port, and that reduces the outflow noise of the air that flows out of the air outflow port. The silencer (60) comprises a flow-regulating plate (69).
