To decrease noise of blast by coaxially connecting an axial blower having low blast pressure and large blast flow rate to a centrifugal blower having high blast pressure and small blast flow rate by one rotary shaft.

In a blower 1, when a rotary shaft 3 is rotated by a fan motor, an axial blower 2 and a centrifugal blower 5 are simultaneously interlocked with each other and rotated in the same direction with the same speed of revolution. Outside air is sucked from a bell mouth 6 to the inside, forcibly fed downstream in the axial direction by the axial blower 2, and blown out to the blow- out side 4 by the specified wind capacity and wind pressure. The blown air is forcibly fed outward in the centrifugal direction by the centrifugal blower 5 by the specified wind capacity and wind pressure, and blown from a blow-out passage to the outside. Therefore, blast noise can be decreased in comparison with a case where only the axial blower or only the centrifugal blower is used.