A tire mold comprising a pair of side plates, a pair of bead rings abutting on the side plates, and a gas venting passage, wherein each of the bead rings has: a cavity surface; an outer side surface; and an outer peripheral surface having two regions, wherein a first and second outer peripheral surface adjoins the cavity surface. A first gap is lying between the first outer peripheral surface and the side plate by the presence of a knurled groove. A second gap is lying between the second outer peripheral surface and the side plate. A third gap is lying between the outer side surface and the side plate by the presence of a plurality of vent grooves. The first to third gaps function as the gas venting passage.