It is an object of the present invention to reduce tire vibration during high-speed travel on paved roads without lowering traction performance in fields. An agricultural machine tire includes: lug blocks (12) that are disposed in a tread portion (16) and are formed alternately on both sides of a tire equatorial plane (CL) in a tire circumferential direction； and a central rib (14) that extends in the tire circumferential direction at a tire width direction central portion of the tread portion (16) and to which end portions of the lug blocks (12) on the tire equatorial plane (CL) side are integrally connected, and when a tire width direction length of the central rib (14) from connecting portions (18) with the end portions to the tire equatorial plane (CL) is taken as a first rib width (w1) and a tire width direction length of the central rib (14) from end edges of the central rib (14) positioned on the tire width direction opposite side from the connecting portions (18) across the tire equatorial plane (CL) to the tire equatorial plane (CL) is taken as a second rib width (w2), the first rib width (w1) is configured to be greater than the second rib width (w2).
