Air supply device and combustion device comprising same

The invention provides an air blowing device capable of appropriately realizing noise reduction and a combustion device comprising the air blowing device. The blower device includes an impeller housed in a casing and rotating, the impeller having a plurality of blades forming a plurality of inter-blade flow paths and a central space portion, and when the impeller rotates, air flowing into the central space portion through an air inlet of the casing passes through the plurality of inter-blade flow paths on the outside side. As a member for reducing noise generated when air passes through a flow path between a plurality of blades, each blade includes: a plurality of first concavo-convex parts in which a first surface side of a first surface and a second surface corresponding to the front and back surfaces of each blade is concave and the other second surface side is convex; and a plurality of second concavo-convex parts which are opposite to the plurality of first concavo-convex parts, the second surface side o