Air cleaner for an internal combustion motor

An air cleaner for an internal combustion motor, provided with a filter cartridge (10) made of special pleated paper, with an holding edge (9) which is fixed inside the case (2) of the filter (1), so that the plane that it defines is bent in relationship to the longitudinal axis of the exit conduit for the air (4); the paper body of the cartridge consisting of a parallelepiped the longer sides of which are parallel to the plane defined by the holding edge (9) and the shorter sides of which are parallel to the axis of the exit conduit for the air (4).