A CPAP device in which the compatibility between size reduction/weight reduction and reduction of inflow sound is achieved is provided. The CPAP device includes a housing 11 which includes an air inflow opening 11a and an air outflow opening 11b, a turbofan 50 which is housed in the housing 11 to draw in air and send out the air, and a silencer 40 which is housed in the housing 11, composed of sound absorbing members 41 and 42, includes an air flow path 411 having a tabular shape, and reduces an inflow sound of the air flowing in from the air inflow opening 11a to feed the air to the turbofan 50.
