To prevent a sheet from moving during cutting by preventing a fixing plate from rising ahead in the cutting direction.

This cutter 10 includes a base 1, the fixing plate 2, a slider 30, a rail 4, and a support body 5 for supporting the rail pressed up. The fixing plate is disposed along the rail. The sheet is moved in the cutting direction while the slider is pressed, thereby cutting the sheet while fixing it with the fixing plate. A projection 38 pointing upward is disposed in a front part of the cutting direction A on the top surface of the slider. By moving the slider while pressing the projection, a front part of the slider is pressed towards the base and raise of the fixing plate is prevented.