A rotary milling tool in which a plurality of chip discharge grooves are provided to the outer periphery of a tip part of a tool body , the plurality of chip discharge grooves extending from the tool tip toward the tool base, and bottom blades are provided to an intersection ridge part at the intersection of a rake surface of the chip discharge grooves and a tip flank surface of the tool body , each of the bottom blades being formed integrally with the tool body , wherein a convex edge that is convex toward a tool-axis-direction tip is formed on at least one of the bottom blades , and the convex edge is formed by the connection of a plurality of substantially linear edges, wherein the convex edge is obtusely formed by the connection of a first linear edge gradually inclined upward toward the tool tip, the first linear edge extending in a direction from the outer periphery of the tool toward the center of the tool, and a second linear edge gradually inclined downward toward the tool base, the second linear edge extending in the direction from the outer periphery of the tool toward the center of the tool, wherein the rotary milling tool is characterized in that a concavity angle (α) of the bottom blade having the convex edge is equal to or greater than -5° and less than 0°, the concavity angle (α) being formed by a virtual line extending in a direction perpendicular to the tool axis and the first linear edge , the length (M) of a concave part of the bottom blade having the convex edge along the direction perpendicular to the tool axis is equal to or greater than 0.002 mm and equal to or less than one-fourth the outer diameter of the tool, and the rake angle of the bottom blade having the convex edge is equal to or greater than 5° and equal to or less than 30°, the concave part being defined as the region from the tip corner part of the bottom blade to the connection point between the first linear edge and the second linear edge . wherein the convex edge is obtusely formed by the connection of a first linear edge gradually inclined upward toward the tool tip, the first linear edge extending in a direction from the outer periphery of the tool toward the center of the tool, and a second linear edge gradually inclined downward toward the tool base, the second linear edge extending in the direction from the outer periphery of the tool toward the center of the tool, wherein the rotary milling tool is characterized in that a concavity angle (α) of the bottom blade having the convex edge is equal to or greater than -5° and less than 0°, the concavity angle (α) being formed by a virtual line extending in a direction perpendicular to the tool axis and the first linear edge , the length (M) of a concave part of the bottom blade having the convex edge along the direction perpendicular to the tool axis is equal to or greater than 0.002 mm and equal to or less than one-fourth the outer diameter of the tool, and the rake angle of the bottom blade having the convex edge is equal to or greater than 5° and equal to or less than 30°, the concave part being defined as the region from the tip corner part of the bottom blade to the connection point between the first linear edge and the second linear edge . <EOS>