Abstract: A plurality of segments for molding a tread part of a tire are easily opened and closed by a mold for tire molding of a simple structure. The plurality of segments (5) are energized toward an outside (R2) in the tire radial direction (R). The segments (5) each have a first contacting part (5B) which comes into contact with an outer ring (6) moved toward one side in the tire width direction, and a second contacting part (5C) which comes into contact with the outer ring (6) moved toward the other side in the tire with direction (W). The outer ring (6) has a first sliding part (6D) which pushes the first contacting part (5B) toward the inside (R1) in the tire radial direction (R) and a second sliding part (6E) which pushes the second contacting part (5C) toward the outside (R2) in the tire radial direction (R).