Preventing simply and firmly occurrence of a puncture caused by mutual contact of wall faces of a tube. Thick wall portions are formed at portions of a tube included in a tire and the thick wall portions are brought into contact with thin wall portions when the tire engages on a hazard and the tire and the tube are squeezed between flange portions of a rim and the hazard. The thick wall portions are not damaged since they have an increased strength and also the thin wall portions are protected against damage caused by a load since the load exerting on the thin wall portions is dispersed by the thick wall portions which are readily subjected to elastic deformation. The thin wall portions may be rendered thick wall portions and the thick wall portions may be brought into mutual contact.