NON-PNEUMATIC TIRE AND TIRE ASSEMBLY

The present invention provides an non-pneumatic tire (3) including an inner cylinder (21) that surrounds an outer peripheral surface of a metal rim (12) from an outside in a tire radial direction, an outer cylinder (22) that surrounds the inner cylinder from the outside in the tire radial direction, a plurality of elastically deformable connecting members (23) that connects an outer peripheral surface of the inner cylinder and an inner peripheral surface of the outer cylinder (22) to each other, in which the inner cylinder (21) is made of a synthetic resin material, a pair of holding flange portions (15) is formed on the outer peripheral surface of the rim (12), the rim (12) includes a first split body (16) and a second split body (17), a size of the inner cylinder (21) in a tire width direction is greater than a distance between inner surfaces, which face each other in the tire width direction, of the pair of holding flange portions (15), and the inner cylinder (21) is formed to be elastically deformable in the tire width direction.