To provide at a low cost an electric cutter simultaneously having both a function of raising a cutting precision more improved with respect to an aimed marking-off line and further a function of improving workability in a dark place when an operator processes material.

There are provided changing means 3, 4 and 7 which change a light source supplied from a lighting system 24 and indicate on a material 10 to be cut markers 11, 12 and 13 situated on an extension line of an edge tool 5.