Pneumatic tire for heavy load

A pneumatic tire for heavy load comprising:

• a tread rubber provided on a tread;
• a belt layer including a plurality of belts provided on an inner side in a tire radial direction of the tread rubber;
• three or more main grooves provided on a tread surface of the tread rubber and extending in a tire circumferential direction;
• and
• a plurality of ribs formed by the main grooves on the tread surface,
• wherein the three or more main grooves include a shoulder main groove provided on an outer side in a tire axial direction,
• the plurality of ribs include a shoulder rib formed on the outer side in the tire axial direction of the shoulder main groove,
• the shoulder rib includes a thin groove extending in the tire circumferential direction on an inner side in the tire axial direction of a ground contact end, a main body rib formed on the inner side in the tire axial direction of the thin groove, a sacrifice rib formed on the outer side in the tire axial direction of the thin groove, and sipes provided in the main body rib and opening to the thin groove, and
• a depth Dg of the thin groove, a depth Dm of the shoulder main groove, and a depth Ds of the sipe satisfy the following formulas (1) and (2).
• 1.10≤Dg/Dm≤1.20 formula (1)
• 0.5≤Ds/Dg≤0.7 formula (2)