In a pneumatic tire for heavy load according to the embodiment, a shoulder rib provided on a tread surface includes a thin groove extending in a tire circumferential direction on an inner side in a 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 an 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 a shoulder main groove, and a depth Ds of the sipe satisfy 1.10≤Dg/Dm≤ 1.20 and 0.5≤Ds/Dg≤0.7.