A handsaw having a plurality of saw teeth arranged on a longitudinal edge of a saw blade , the saw teeth being configured as prism-shaped teeth each having a shape of a prism, the prism-shaped teeth being configured such that at least adjacent prism-shaped teeth rise at a same rising angle from an edge surface of the longitudinal edge of the saw blade , to cause a space between the adjacent prism-shaped teeth to be constant in a rising direction in which the teeth rise, characterised in that ; - the prism-shaped teeth are triangular prism-shaped teeth , the prism-shaped teeth each have at least one lateral face configured to be a flush lateral face that rises flush with one of front and back surfaces (20a; 20b) of the saw blade , the prism-shaped teeth are arranged in alternating orientations one after another such that the flush lateral faces of the respective teeth are located alternately on the front and back surfaces (20a; 20b) of the saw blade , a lateral edge, among lateral edges of each prism-shaped tooth , that belongs to the flush lateral face has a vertical cutting edge formed thereon, each prism-shaped tooth has an obliquely cut end face at a tip end of the tooth obtained by obliquely truncating the prism, and among edges belonging to the obliquely cut end face , an edge that does not belong to the flush lateral face has a horizontal cutting edge (HE 1) formed thereon; and - each triangular prism-shaped tooth with three lateral edges (30a; 30b; 30c) on the prism has two lateral edges (30a; 30c) configured as lateral edges of the flush lateral face that rises flush with one of the front and back surfaces (20a; 20b) of the saw blade and the remaining lateral edge configured as a lateral edge line rises flush with the other of the front and back surfaces (20a; 20b) of the saw blade , and the obliquely cut end face of each triangular prism-shaped tooth is configured to become an oblique triangle that extends across the front and back surfaces (20a; 20b) of the saw blade , wherein the remaining lateral edge has spaces (S) at both sides of it. - the prism-shaped teeth are triangular prism-shaped teeth , the prism-shaped teeth each have at least one lateral face configured to be a flush lateral face that rises flush with one of front and back surfaces (20a; 20b) of the saw blade , the prism-shaped teeth are arranged in alternating orientations one after another such that the flush lateral faces of the respective teeth are located alternately on the front and back surfaces (20a; 20b) of the saw blade , a lateral edge, among lateral edges of each prism-shaped tooth , that belongs to the flush lateral face has a vertical cutting edge formed thereon, each prism-shaped tooth has an obliquely cut end face at a tip end of the tooth obtained by obliquely truncating the prism, and among edges belonging to the obliquely cut end face , an edge that does not belong to the flush lateral face has a horizontal cutting edge (HE 1) formed thereon; and - each triangular prism-shaped tooth with three lateral edges (30a; 30b; 30c) on the prism has two lateral edges (30a; 30c) configured as lateral edges of the flush lateral face that rises flush with one of the front and back surfaces (20a; 20b) of the saw blade and the remaining lateral edge configured as a lateral edge line rises flush with the other of the front and back surfaces (20a; 20b) of the saw blade , and the obliquely cut end face of each triangular prism-shaped tooth is configured to become an oblique triangle that extends across the front and back surfaces (20a; 20b) of the saw blade , wherein the remaining lateral edge has spaces (S) at both sides of it. <EOS>