Patent ID: 6968891

Claim:
A louver fin in which a strip thin sheet is formed into a continuous corrugated shape configured by alternate bent portions and flat portions, and, in each of the flat portions, a plurality of louvers that are punched and raised along a longitudinal direction of the strip thin sheet are arranged in a width direction of the strip thin sheet, comprising: a distortion adjusting portion disposed in each of the bent portions, wherein a virtual quadrangle being assumed, the virtual quadrangle having vertexes respectively configured by: inner ends which are located respectively at a corner of inner cut end faces of the louvers formed in flat portions that are opposed to each other across the bent portion; and outer ends which are located respectively at a corner of outer cut end faces of the louvers, wherein the distortion adjusting portion equalizes a distortion generated in a direction of an inner diagonal line connecting said inner ends of the virtual quadrangle, with distortion generated in a direction of an outer diagonal line connecting said outer ends, the distortion adjusting portion being arranged along one of the inner diagonal line or the outer diagonal line.