The present invention includes: an elastically deformable tire part (7) which includes an inner cylinder, an outer cylinder (4) configured to surround the inner cylinder from the outside in a tire radial direction, and a linking member (3) configured to link the inner cylinder to the outer cylinder (4) and a tread member (5) externally fitted onto the outer cylinder (4), wherein an elastic modulus of a material forming the tread member (5) is smaller than an elastic modulus of a material forming a tire part (7), an outer circumferential surface of the tread member (5) is formed in a curved shape in which the outer circumferential surface thereof protrudes outward in the tire radial direction when viewed in a vertical cross-sectional view in both a tire width direction and the tire radial direction, the outer cylinder (4) includes an outer circumferential section (41) positioned on a tire equatorial section, side sections (42) positioned on both sides in the tire width direction with respect to the outer circumferential section (41), and a shoulder section (43) configured to connect the outer circumferential section (41) to the side sections (42), the outer circumferential section (41) is formed in a straight line shape in which the outer circumferential section (41) extends in the tire width direction when viewed in the vertical cross-sectional view, and the shoulder section (43) gradually extends inward in the tire radial direction as it goes outward in the tire width direction.