A tire vulcanization bladder assembly is manufactured by placing a first ring part on a base stage installed on leg parts in a periphery of a first end opening of a bladder; sandwiching a first clamp part of the bladder, the bladder being in an upright position with the first clamp part on a lower side and a second clamp part located in a periphery of a second end opening of the bladder on an upper side, by the first ring part, thereby attaching the first ring part to the bladder; inserting an inside ring member of a second ring part into the bladder from above on an inside ring member of the first ring part; moving the inside ring member of the second ring part upward relative to the bladder to a position of the second clamp part; and attaching the second ring part to the second clamp part.

A method for manufacturing a pneumatic tire uses a tire vulcanizing bladder including a plurality of vent lines, and is characterized in that the pneumatic tire includes an inner liner on an inner surface thereof, the inner liner has an SIBS layer containing a styrene-isobutylene-styrene triblock copolymer, the SIBS layer has a thickness of more than or equal to 0.05 mm and less than or equal to 0.6 mm, the SIBS layer contains more than or equal to 0.5% by mass and less than or equal to 40% by mass of a polymer obtained by polymerization of a monomer unit having 4 carbon atoms, and the vent lines each include a first vent line at a part corresponding to from a tire bead toe part to a tire buttress part, and a second vent line at a part corresponding to from the tire buttress part to a tire crown part.

A tire-holding device includes: a shaft body having a portion thereof inserted into a bladder which is fixed to the shaft body, the bladder expanding in a tire to hold the tire; and a support body which comes into contact with the shaft body to support the shaft body, the shaft body includes an inner hole placed inside the bladder, and an outer hole placed outside the bladder and is brought into communication with the inner hole, and the support body includes a support hole, and when the support body supports the shaft body, the outer hole and the support hole come into communication with each other irrespective of a position of the shaft body in its circumferential direction.

A bladder-fixing unit fixes a bladder which expands in a tire to hold the tire, the bladder-fixing unit includes a shaft body inserted into the bladder, and a connecting body for fixing the bladder and for connecting the bladder and the shaft body to each other, the connecting body includes a switching mechanism for switching between a state where the connecting body pressurizes and comes into contact with an outer periphery of the shaft body and is fixed to the shaft body, and a movable state where the connecting body can move in an axial direction of the shaft body relative to the shaft body by releasing the state where the connecting body pressurizes and comes into contact with the outer periphery of the shaft body.

A tire-holding device includes: a shaft body having a portion thereof inserted into a bladder which is fixed to the shaft body, the bladder expanding in a tire to hold the tire; and a support body which comes into contact with the shaft body to support the shaft body, the shaft body includes an inner hole placed inside the bladder, and an outer hole placed outside the bladder and is brought into communication with the inner hole, and the support body includes a support hole, and when the support body supports the shaft body, the outer hole and the support hole come into communication with each other irrespective of a position of the shaft body in its circumferential direction.

A bladder-fixing unit fixes a bladder which expands in a tire to hold the tire,

the bladder-fixing unit includes a shaft body inserted into the bladder, and a connecting body for fixing the bladder and for connecting the bladder and the shaft body to each other,

the connecting body includes a switching mechanism for switching between a state where the connecting body pressurizes and comes into contact with an outer periphery of the shaft body and is fixed to the shaft body, and a movable state where the connecting body can move in an axial direction of the shaft body relative to the shaft body by releasing the state where the connecting body pressurizes and comes into contact with the outer periphery of the shaft body.