Patent ID: 7563300

Claim:
An air cleaner comprising: a casing; and a filter element arranged in the casing; wherein: the filter element has mountain portions and valley portions formed continuously and alternately, the mountain portions and valley portions having a predetermined height, at a first end of the filter element, at least an end of the mountain portions is closed, at a second end of the filter element, an end of the valley portions is closed, the filter element is in a form of a cylinder having a hollow portion, the casing has arranged thereon an air inlet pipe which causes air to be filtered to inflow in a direction substantially perpendicular to an axis line direction of the filter element, and an air outlet pipe which causes filtered air to outflow in the axis line direction, the casing has a first supporting portion that clingingly supports an outer circumference of the second end of the filter element in a circumferential direction continuously, and a second supporting portion that clingingly supports an inner circumference of the first end of the filter element in the circumferential direction continuously to close the hollow portion, the first supporting portion being provided on an inner circumference of the casing and the second supporting portion being provided on a protrusion from an inner wall of the casing, and air to be filtered by the filter element inflows to the filter element from a top side of the mountain portions as well as from an end of the valley portions on a first end side of the filter element, and filtered air outflows from an end of the mountain portions on a second end side of the filter element as well as from an inner circumference of the hollow portion.