Abstract: In a hard-film-coated drill having a cemented carbide drill body coated with a hard film, the drill body is provided with a smooth region at a boundary between a flank surface and a rake surface. The surface hardness of the hard film is within 2000 to 2500 HV in Vickers hardness. A radius r1 (?am) of curvature of the first ridgeline L1 where the smooth region and the flank surface intersect is represented by r1=0.45×D+a1 (10?a1?25), where D is the diameter (mm) of the body. A radius r2 (?m) of curvature the second ridgeline L2 where the flank surface and a margin intersect is represented by r2=0.65×D+a2 (39?a2?67). A thickness t1 (?m) of the hard film is represented by t1=0.8×ln(D)+a3 (0.7?a3?3.0).