To provide a high performance dust collecting filter capable of dramatically enhancing efficiency for dust collection without raising aeration resistance at the initial stage as well as having a shape retention property even at a high gas volume.

A multilayered filter using a nonwoven fabric having a surface density of 20-100 g/m2 comprising fibers with an average fiber diameter of 20-60 μm as the first filter 1 positioned at the most upper flow side (D/S) of air, and using at least one layer of a nonwoven fabric having a surface density of 5-70 g/m2 comprising fibers with an average fiber diameter of 5-10 μm as the second filter 2 positioned at the down flow side (C/S).