Provided are a mold for forming a tire including an annular tread molding part a plurality of segments divided into arranged in a circumferential direction arranged in a circumferential direction, and a tire production method and using the same. The mold for forming a tire includes a rotatable shaft perpendicular to a direction of movement of the segment and also to the axis of the tread molding part; a base member supporting the segment to be rotatable around the rotatable shaft; and an external force application mechanism which, when the tread molding part is opened, applies external force to the segment to rotate the segment toward a direction in which a side of the other end of the segment in the direction of the axis is moved around the rotatable shaft toward a radially outer side.