DRESSER

A dresser includes: a mount component; and a cutting edge component inserted in the mount component at a base end portion side, the cutting edge component being fixed to the mount component by bringing, into contact with the mount component, a portion of the cutting edge component inserted in the mount component, the cutting edge component being exposed from the mount component at a front end portion side to form a cutting edge, wherein the portion of the cutting edge component inserted in the mount component has one or more portions in each of which an area of a cross section along a line normal to an insertion direction of the cutting edge component is increased from the front end portion side toward the base end portion side in the insertion direction, and a ratio L1/M1 of a length L1 and a maximum value M1 is more than or equal to 2.1, where L1 represents a length of the portion of the cutting edge component inserted in the mount component and M1 represents a maximum value of a diameter of a circle having an area equal to the area of the cross section of the portion of the cutting edge component inserted in the mount component along the line normal to the insertion direction.