To provide a cutter capable of improving finish precision of a cut face in a short time by making removal of chips smooth during cutting.

In the cutter to simultaneously form both electrode tips by rotating the cuter while being held between two pieces of electrode tips by pressurizing with a welding machine, conical holes 2 are respectively formed on both faces of a disk shaped body 1, a bottomed recessed part 3, which coincides with a diameter and height of the pimpled electrode tip, is formed to the center part of the conical hole, further, plural cutting blades 4 having circular arc shape by a plane view are respectively formed on the surface of the conical hole radially around the bottomed recessed part at an interval 4A.