To provide a cutting tool which is detachably mounted on a gun-shaped driving tool, can avoid hindrance of its cutting procedure by cut pieces of a material, and achieves easy and quick cutting through a long distance, to thereby improve the workability thereof.

The cutting tool 1 is formed of a plastic mount member 10 detachably mounted on the power tool 2; a fixed blade member 11 having its rear end fixed to the mount member 10, and its front end formed into a fixed blade 11a; a rocking blade member 12 having its rear end receiving a driving force from a rotating drive shaft 3, and its front end formed into a rocking blade 12a; a pivotal bolt 13 for rockably pivoting the rocking blade member 12 on the fixed blade member 11; and a fastening bolt 14 for fastening the mount member 10 when mounted on the power tool 2.