A tire vulcanizing device includes an upper plate and a lower plate which can be relatively displaced toward and away from each other, and a mold for vulcanizing and molding a tire arranged between the upper plate and the lower plate. The mold includes an upper and a lower side mold members arranged on the upper plate side and the lower plate side, respectively, and a plurality of sector mold members arranged between the upper and the lower side mold members. An outer ring for positioning the sector mold members in the radial direction is arranged on the lower plate side. An actuator for opening the sector mold member is arranged on the lower plate, capable of vertical elevation.