A tire (1) includes: a tread (2); a pair of sidewalls (3) that extends almost inward, in a radial direction, from ends of the tread (2); a pair of beads (4) positioned almost inward of the sidewalls (3) in the radial direction; and a clinch portion (5) that extends from the sidewalls (3) to the beads (4), wherein a concave curved surface (21) extends on an outer surface of the clinch portion (5) in a circumferential direction, and a convex curved surface (22) formed on an outer side end, in the radial direction, of a rim flange (30) is engageable with the concave curved surface (21), a ratio R1/R of a radius of curvature R1 of the concave curved surface (21) to a radius of curvature R of the convex curved surface (22) of the rim flange, satisfies 1.7≦R1/R≦2.5, and the radius of curvature R1 of the concave curved surface (21) and the radius of curvature R of the convex curved surface (22) are each a radius of curvature of an arc on a cross section as taken along a plane including a center axis of the tire.