Tire mold and pneumatic tire

A pneumatic tire, comprising:

• a tread portion formed by a plurality of sector molds disposed in a tire circumferential direction;
• a plurality of insertion holes into which stud pins are inserted, the plurality of insertion holes being formed in the tread portion by mold pins provided on inner surfaces of the plurality of sector molds that oppose the tread portion and projecting inward in a tire radial direction;
• the stud pins each comprising a body portion and a bottom flange portion;
• the plurality of insertion holes each comprising a first hole portion with a first inner diameter where the body portion of the stud pin is disposed and a second hole portion with a second inner diameter greater than the first inner diameter where the bottom flange portion of the stud pin is disposed;
• and
• the first inner diameter of the first hole portion of an end insertion hole of the plurality of insertion holes formed in an end region on one side in the tire circumferential direction of a predetermined region formed by one of the plurality of sector molds of the tread portion being greater than the first inner diameter of the first hole portion of a middle insertion hole of the plurality of insertion holes formed in a middle region of the predetermined region formed by the one of the plurality of sector molds, the middle region being located between the end region on the one side and an end region on another side in the tire circumferential direction of the predetermined region formed by the one of the plurality of sector molds.