Heat transfer fin

The heat transfer fin provided by the utility model comprises a plate-shaped fin body, and a plurality of through holes, and a through-hole formed in the fin body, the first and second electrodes arespaced apart from each other in a first direction that is a predetermined direction. When the flowing direction of combustion gas to flow along the surface of the fin body is set to be the second direction, the combustion gas flows along the fin body. Wherein the fin body comprises a tail end peripheral part; and a terminal peripheral section that surrounds a first terminal region, which is a region located on the most upstream side with respect to the second direction, among regions on the through-hole. A ratio of a shortest distance between an inner boundary of the tip peripheral portion andan outer boundary of the tip peripheral portion acquired in a region located on the most upstream side with respect to the second direction among regions on the tip peripheral portion to a shortest distance between an inner b