Cutting edge position adjustment mechanism and cutting edge-replaceable cutting tool

A cutting edge position adjustment mechanism for moving a cutting edge member mounted on a tool body with respect to the tool body to adjust the position of a cutting edge of the cutting edge member, the cutting edge position adjustment mechanism comprising:

• a shaft member that is provided to extend between the tool body and the cutting edge member and threadably engages with the tool body;
• and
• a nut member that threadably engages with the shaft member and abuts against the cutting edge member,
• wherein a first screw section that threadably engages with the tool body and a second screw section that threadably engages with the nut member are provided coaxially on the shaft member at mutually different positions along the direction of an axis line of the shaft member,
• wherein the thread pitch of the first screw section and the thread pitch of the second screw section are different from each other,
• wherein, the shaft member includes at least one operation hole, and the nut member includes at least one operation hole.