A milling tool comprising: a body having an outer circumferential surface formed around a central axis; a cutting insert having a rake surface, a flank surface continuing to the rake surface, and a cutting edge formed by a ridgeline of the rake surface and the flank surface; and a screw attaching the cutting insert to the body, the outer circumferential surface having an insert attachment portion which is recessed toward the central axis and to which the cutting insert is attached, the insert attachment portion being defined by a first seat surface continuing to the outer circumferential surface and a second seat surface continuing to the first seat surface, the first seat surface being located rearward with respect to the rotational direction of the milling tool, the second seat surface having a flat portion, the flat portion having a screw hole in which the screw is inserted, the cutting edge being formed of a sintered material containing at least one of cubic boron nitride and polycrystalline diamond, in a cross section perpendicular to the central axis, a first angle (Θ1) formed by a first direction and a second direction being an acute angle, the first direction being a direction in which the screw hole extends, the second direction being a direction perpendicular to the flat portion of the second seat surface and oriented inward of the body, wherein the first direction is rotated from the second direction along the rotational direction of the milling tool, characterised that the second direction is rotated from a third direction which is a direction from the cutting edge toward the central axis as seen in end view by an angle (Θ2) of more than 0° and less than 90° along a rotational direction of the milling tool. a body having an outer circumferential surface formed around a central axis; a cutting insert having a rake surface, a flank surface continuing to the rake surface, and a cutting edge formed by a ridgeline of the rake surface and the flank surface; and a screw attaching the cutting insert to the body, the outer circumferential surface having an insert attachment portion which is recessed toward the central axis and to which the cutting insert is attached, the insert attachment portion being defined by a first seat surface continuing to the outer circumferential surface and a second seat surface continuing to the first seat surface, the first seat surface being located rearward with respect to the rotational direction of the milling tool, the second seat surface having a flat portion, the flat portion having a screw hole in which the screw is inserted, the cutting edge being formed of a sintered material containing at least one of cubic boron nitride and polycrystalline diamond, in a cross section perpendicular to the central axis, a first angle (Θ1) formed by a first direction and a second direction being an acute angle, the first direction being a direction in which the screw hole extends, the second direction being a direction perpendicular to the flat portion of the second seat surface and oriented inward of the body, wherein the first direction is rotated from the second direction along the rotational direction of the milling tool, characterised that the second direction is rotated from a third direction which is a direction from the cutting edge toward the central axis as seen in end view by an angle (Θ2) of more than 0° and less than 90° along a rotational direction of the milling tool.