To provide a mold for molding a tire and a tire manufacturing method, capable of simply and accurately controlling the length of spew or rubber burr generated at the time of production of a tire and capable of enhancing production efficiency.

In the mold 2 for molding the tire having a vent hole 1, the vent hole 1 has a hole diameter calculated by general formula 1; Y1=5.662Y2+0.872X1-4.967X2-0.01 [wherein, Y1 is an estimate value of the length of spew, Y2 is the hole diameter of the selected vent hole, X1 is the known length of spew obtained by a vent hole set to a standard and X2 is the hole diameter of the standard vent hole. The material and vulcanizing molding condition of a green tire are made almost constant].