PURPOSE: To sharply cut the root of a beard as deep as possible, by a method wherein an edge part is formed at the border on the side of a beard-guiding hole of a beard- guiding curved surface, and a height between the edge part and an inner cutting edge- sliding surface is specified within the range of a specific dimension.

CONSTITUTION: The present edge consists of a number of beard-guiding holes 1 and a rib 2 between these holes, and the rib forms the beard-guiding holes 1. For the sectional configuration of the rib 2 between the holes, a beard-guiding curved surface 3b in the shape of a projection is formed on the side of the beard-guiding hole 1 of an exterior 3 of the rib 2 between the holes, and an inner cutting edge-sliding surface 4a is formed on an inside 4 of the rib 2 between the holes. Each of edge parts 7 is formed at a border 5 on the side of the beard-guiding hole 1 of the beard-guiding curved surface 3b, and the edge part 7 is located at the position being on the side of the beard-guiding hole 1 and being a little on the side of the exterior 3 as compared with the position of a border 6 on the side of the beard-guiding hole of the inner cutting edge-sliding surface 4a. That is, a height 'h' between the edge part 7 and the inner cutting edge-sliding surface 4a is specified at the range of 0<h≤15μ. As the result of it, it is made possible to cut sharply to the root of a beard as deep as possible.