A cutting edge-replaceable cutting tool including a tool body rotatable around a tool axis line, a cutting edge member detachably mounted on a tip outer peripheral section of the tool body and allowing a cutting edge to protrude toward at least any one of a tool tip side and a tool radial outer side, and a cutting edge position adjustment mechanism for moving the cutting edge member mounted on the tool body with respect to the tool body to adjust the position of the 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, and wherein the thread pitch of the first screw section and the thread pitch of the second screw section are different from each other, characterized in that engagement sections (25, 27) with which a working tool is engageable are formed in the shaft member and the nut member which are rotatable around the axis line. a cutting edge position adjustment mechanism for moving the cutting edge member mounted on the tool body with respect to the tool body to adjust the position of the 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, and wherein the thread pitch of the first screw section and the thread pitch of the second screw section are different from each other, characterized in that engagement sections (25, 27) with which a working tool is engageable are formed in the shaft member and the nut member which are rotatable around the axis line. 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, and wherein the thread pitch of the first screw section and the thread pitch of the second screw section are different from each other, characterized in that engagement sections (25, 27) with which a working tool is engageable are formed in the shaft member and the nut member which are rotatable around the axis line.