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 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 at both sides of it.