A tire vulcanization device, comprising: segments respectively attached to an outer circumferential surface of each of a plurality of sector molds disposed in an annular shape; an upper plate attached to an upper surface of an upper side mold; a lower plate attached to a lower surface of a lower side mold; a container ring disposed on an outer circumferential side of the segments; a bolster plate disposed above the upper plate and connected to the container ring; and a pressurizing mechanism configured to move the bolster plate up and down, by moving the bolster plate downward, the sector molds being assembled in an annular shape between the upper plate and the lower plate, and the sector molds being closed while being vertically sandwiched between the upper side mold and the lower side mold, the tire vulcanization device being characterised by comprising: a connecting body interposed between the bolster plate and the container ring to connect the bolster plate and the container ring; and a fluid supply unit configured to supply pressurizing fluid, in a state where the container ring is held slidably in a vertical direction with respect to the bolster plate by the connecting body and a vertical position of the bolster plate is maintained in a mold closed position, by moving the container ring downward with respect to the bolster plate by the pressurizing fluid supplied by the fluid supply unit, the sector molds being assembled in an annular shape to be closed with the upper side mold pressed against upper surfaces of the sector molds. segments respectively attached to an outer circumferential surface of each of a plurality of sector molds disposed in an annular shape; an upper plate attached to an upper surface of an upper side mold; a lower plate attached to a lower surface of a lower side mold; a container ring disposed on an outer circumferential side of the segments; a bolster plate disposed above the upper plate and connected to the container ring; and a pressurizing mechanism configured to move the bolster plate up and down, by moving the bolster plate downward, the sector molds being assembled in an annular shape between the upper plate and the lower plate, and the sector molds being closed while being vertically sandwiched between the upper side mold and the lower side mold, the tire vulcanization device being characterised by comprising: a connecting body interposed between the bolster plate and the container ring to connect the bolster plate and the container ring; and a fluid supply unit configured to supply pressurizing fluid, in a state where the container ring is held slidably in a vertical direction with respect to the bolster plate by the connecting body and a vertical position of the bolster plate is maintained in a mold closed position, by moving the container ring downward with respect to the bolster plate by the pressurizing fluid supplied by the fluid supply unit, the sector molds being assembled in an annular shape to be closed with the upper side mold pressed against upper surfaces of the sector molds. a connecting body interposed between the bolster plate and the container ring to connect the bolster plate and the container ring; and a fluid supply unit configured to supply pressurizing fluid, in a state where the container ring is held slidably in a vertical direction with respect to the bolster plate by the connecting body and a vertical position of the bolster plate is maintained in a mold closed position, by moving the container ring downward with respect to the bolster plate by the pressurizing fluid supplied by the fluid supply unit, the sector molds being assembled in an annular shape to be closed with the upper side mold pressed against upper surfaces of the sector molds.