To provide a tire mold, in which the exchanges of a segment part and of side plate parts are not necessary, and it suffices if only the bead ring parts are exchanged in the vulcanization of a tire changed-over to a tire having the same pattern and different in size, and the vulcanizing method of a tire employing this tire mold.

This tire mold consists of a segment part 3, side plate parts 2 and bead ring parts. In this case, the split position between the side plate part 2 and the bead ring part 11 or 12 is set so as to realize the commonly use of the side plate part 2 between tires different in size. After the tire mold is attached to a vulcanizer and the tire having a specified pattern is vulcanized, when the exchange of the vulcanized tire is intended to be exchanged for a tire, which has the same pattern as that of the vulcanized tire and is different in size, only the bead ring parts are exchanged without exchanging the segment part 3 and the side plate parts 2.