A drilling tip attachable to a distal end portion of a drill bit to perform drilling, the drilling tip comprising: a tip main body that has a posterior end portion having a columnar or disk shape centered on a tip center line (C) and a distal end portion having an outer diameter from the tip center line (C), which gradually decreases from the posterior end portion toward a distal end side, and is made of a cemented carbide; and a hard layer that coats the distal end portion of the tip main body and is made of a polycrystalline diamond sintered body, wherein the distal end portion of the tip main body has a convex portion having a convex arc shape of which a surface is convex toward the distal end side in a cross section taken along the tip center line (C), and a concave portion having a concave arc shape in a cross section taken along the tip center line (C), of which a surface tangents to a convex arc in the cross section of the convex portion and which extends to an outer peripheral side as going toward a posterior end side of the tip main body , a diameter D of the posterior end portion of the tip main body is within a range of 8 mm to 20 mm, with respect to the diameter D of the posterior end portion of the tip main body , a ratio r1/D of a radius r1 of the convex arc of the convex portion in the cross section is within a range of 0.1 to 0.65, and a ratio r2/D of a radius r2 of a concave arc of the concave portion in the cross section is within a range of 0.05 to 3.0, and an angle θ (°) formed by a straight line (L) that connects a point (P) which the convex portion tangents to the concave portion and a center (Q) of the convex arc of the convex portion to each other with respect to the tip center line (C) in the cross section is within a range of 20° to 90°. a tip main body that has a posterior end portion having a columnar or disk shape centered on a tip center line (C) and a distal end portion having an outer diameter from the tip center line (C), which gradually decreases from the posterior end portion toward a distal end side, and is made of a cemented carbide; and a hard layer that coats the distal end portion of the tip main body and is made of a polycrystalline diamond sintered body, wherein the distal end portion of the tip main body has a convex portion having a convex arc shape of which a surface is convex toward the distal end side in a cross section taken along the tip center line (C), and a concave portion having a concave arc shape in a cross section taken along the tip center line (C), of which a surface tangents to a convex arc in the cross section of the convex portion and which extends to an outer peripheral side as going toward a posterior end side of the tip main body , a diameter D of the posterior end portion of the tip main body is within a range of 8 mm to 20 mm, with respect to the diameter D of the posterior end portion of the tip main body , a ratio r1/D of a radius r1 of the convex arc of the convex portion in the cross section is within a range of 0.1 to 0.65, and a ratio r2/D of a radius r2 of a concave arc of the concave portion in the cross section is within a range of 0.05 to 3.0, and an angle θ (°) formed by a straight line (L) that connects a point (P) which the convex portion tangents to the concave portion and a center (Q) of the convex arc of the convex portion to each other with respect to the tip center line (C) in the cross section is within a range of 20° to 90°. <EOS>