To provide a tire molding mold which can uniformly adjust the clearance between pieces with a mold opening/closing action.

In the tire molding mold in which a tread mold part in contact with a tire tread surface is made of a plurality of sectors 5 partitioned in the tire circumference direction, and the sector 5 is composed by incorporating a plurality of the pieces 6 partitioned in the tire circumference direction in the inner surface side of a back segment 7, the sector 5 has a clearance adjustment member 8 expending in the tire circumference direction to straddle a plurality of the pieces 6. The clearance adjustment member 8 is fixed to each of the straddled pieces 6 and made of a material having a thermal expansion coefficient larger than that of the piece 6.