The present invention relates to a cutting tool. An object of the present invention is to provide a cutting tool with a cutting insert with a simple structure can be attached reliably to the pocket portion of the body. Cutting tool according to the present invention has a body including a top surface, when, and top and bottom portions forget that the cutting insert and the cutting insert having a side surface between the mounting. Wherein when is entirely convex downward, the reference surface and the inclined first inclined surface and the body inward of the body with respect to the reference plane when extending to the upper surface from the reference surface on both sides is that the cutting insert mounted in the pocket portions of the second inclined surface comprises an inclined outward. Includes the pocket portion side and a bottom surface, side surface and a second sloped surface of the cutting insert is supported by the side surface and bottom surface, each pocket portion. Accordingly, when the cutting insert, and, instead of being a separate fastening means are provided in the pocket of the bottom surface, with a simple structure in which the second inclined surface is provided on the lower surface of the cutting insert, of the main claim, while functioning as a surface 2 slopes equipped to offer resistance to the cutting force acting in the lateral direction to the cutting insert, the cutting insert may be fixed to the pocket portion of the body to reliably.