To provide a sheet cutter and scissors having a simple constitution, giving no discomfort and scarcely allowing adhesive of a cut object material such as an adhesive tape with high stickiness to be stuck to cutter bodies while preventing occurrence of an accidental trouble in cutting the cut object material.

Folds 24a and 24b extending from ends X in the sides of ridges 20a and 20b in the sides of cutting edges 16a and 16b of the cutter bodies 12a and 12b of scissors bodies to ends Z in the sides of cutting edges 18a and 18b of the cutter bodies 12a and 12b across ends Y in the sides of a support shaft 14 of blade portions 22a and 22b are formed in the sides of the ridges 20a and 20b of the blade portions 22a and 22b. The blade portions 22a and 22b are formed by being mutually folded inward by using the respective folds 24a and 24b as the boundary.