A pneumatic tire for an agricultural vehicle, the pneumatic tire comprising: a center rib that is provided on an outer circumference of a tread portion, that protrudes towards an outer side in a tire radial direction, that has width on both sides sandwiching a tire equator, and that extends in a tire circumferential direction; and lugs that are provided on the outer circumference of the tread portion, that protrude towards the outer side in the tire radial direction on both sides in a width direction of the center rib, that are joined integrally with two end surfaces of the center rib, and that are disposed respectively on one side and on another side of the center rib in the width direction thereof so as to be at intervals from each other in the tire circumferential direction on both the one side and the other side, wherein: the center rib has a width of from 30% to 50% of a tread width of the tread portion, and within a range where the lugs are disposed at 25% or greater of the tread width from the equator, the lugs are formed at an angle of from 20° to 50°, relative to a tire rotation axis direction, on an opposite side from a tire rotation direction, and a sum total of a surface area of ground-contacting surfaces of all of the lugs is from 4.5% to 15% of a surface area of the tread portion in a case in which the tread portion is unrolled as a flat surface and seen in plan view, characterized in that, the two end surfaces are inclined so as to slope respectively in a direction towards the tire equator as the two end surfaces approach the outer side in the tire radial direction. a center rib that is provided on an outer circumference of a tread portion, that protrudes towards an outer side in a tire radial direction, that has width on both sides sandwiching a tire equator, and that extends in a tire circumferential direction; and lugs that are provided on the outer circumference of the tread portion, that protrude towards the outer side in the tire radial direction on both sides in a width direction of the center rib, that are joined integrally with two end surfaces of the center rib, and that are disposed respectively on one side and on another side of the center rib in the width direction thereof so as to be at intervals from each other in the tire circumferential direction on both the one side and the other side, wherein: the center rib has a width of from 30% to 50% of a tread width of the tread portion, and within a range where the lugs are disposed at 25% or greater of the tread width from the equator, the lugs are formed at an angle of from 20° to 50°, relative to a tire rotation axis direction, on an opposite side from a tire rotation direction, and a sum total of a surface area of ground-contacting surfaces of all of the lugs is from 4.5% to 15% of a surface area of the tread portion in a case in which the tread portion is unrolled as a flat surface and seen in plan view, characterized in that, the two end surfaces are inclined so as to slope respectively in a direction towards the tire equator as the two end surfaces approach the outer side in the tire radial direction. the center rib has a width of from 30% to 50% of a tread width of the tread portion, and within a range where the lugs are disposed at 25% or greater of the tread width from the equator, the lugs are formed at an angle of from 20° to 50°, relative to a tire rotation axis direction, on an opposite side from a tire rotation direction, and a sum total of a surface area of ground-contacting surfaces of all of the lugs is from 4.5% to 15% of a surface area of the tread portion in a case in which the tread portion is unrolled as a flat surface and seen in plan view, characterized in that, the two end surfaces are inclined so as to slope respectively in a direction towards the tire equator as the two end surfaces approach the outer side in the tire radial direction.