was coated on each substrate wherein the designed coating layer structure and thickness of each layer is shown in table 11 in order to manufacture conventional coated cemented carbide end mills the same substrates and coating layer structures but outer titanium oxide layers compared to the present invention were applied wherein the designed coating layer structure and thickness of each layer is shown in table 12 coated cemented carbide end mills in accordance with the present invention 1 through 8 and conventional coated cemented carbide end mills 1 through 8 were thus manufactured further for coated cemented carbide end mills of the present invention 1 through 3 and conventional coated cemented carbide end mills 1 through 3 the following cutting tests were conducted work piece 100 mm u00d7 250 mm thickness 50 mm jis sus304 square bar for coated cemented carbide end mills of the present invention 4 through 6 and conventional coated cemented carbide end mills 4 through 6 the following cutting tests were conducted work piece 100 mm u00d7 250 mm thickness 50 mm jis s15c square bar for coated cemented carbide end mills of the present invention 7 and 8 and conventional coated cemented carbide end mills 7 and 8 the following cutting tests were conducted work piece 100 mm u00d7 250 mm thickness.