To provide a tire manufacturing device and tire manufacturing method as well as tire vulcanizing/molding bladder used for the same capable of effectively discharging the air remaining between an inner surface of a green tire and the bladder.

The bladder 14 includes: a tread part molding area 1402; a sidewall part molding area 1404; a bead part molding area 1406; and a mounting part area 1408. The thickness of the bladder 14 constituting the bead part molding area 1406 is larger than that of the bladder 14 constituting the tread part molding area 1402 and the sidewall part molding area 1404. The thickness of the bladder 14 constituting the bead part molding area 1406 becomes greater as approaching the mounting part area 1408 side. The thickness of the bladder 14 constituting the end part of the bead part molding area 1406 at the mounting part area 1408 side is formed in dimension of 1.4 to 2.0 times of the thickness of the bladder 14 positioned within the range of 65 to 95% of the cross-section height H of the bladder 14.