The invention provides a tool head which can easily correct the shape of a tooth surface. The tool head has a disk shaped main head body forming installation holes which are provided with a first reference plane and a second reference plane on one corner; a blade; and a fastening mechanism, wherein the first reference plane and the second reference plane are formed on in a direction such that they receive the cutting load acting on the blade; wherein the fastening mechanism has a screw; a partitioning member; a tightening member; and a pressing member; wherein the pressing member presses a base section of the blade against the first and the second reference surfaces, a first tightening member that is installed on one end side of the screw member, and a second tightening member that is installed on the other end side of the screw member are provided as the tightening member; and a first pressing member having a first inclined surface that comes in contact with an inclined surface of the first tightening member, and a second pressing member having a second inclined surface that comes in contact with an inclined surface of the second tightening member are formed on the pressing member, and the second pressing member is opposite to the first pressing member across the partitioning member.