Tire curing mold and manufacturing method for tire

A tire curing mold comprising:

• a molding surface that comes into contact with an outer surface of a tire set to a cavity;
• an exhaust hole, wherein the exhaust hole is provided in the molding surface and allows communication between an inner portion of the cavity and an external portion of the tire curing mold;
• a vent plug, wherein the vent plug is installed within the exhaust hole open to the molding surface,
• wherein the vent plug comprises a tubular housing, a stem and an urging member;
• wherein an inner portion of the tubular housing forms an exhaust passage;
• wherein the tubular housing has an opening portion and a lower end portion;
• and the opening portion of the tubular housing is closer to the cavity than the lower end portion;
• wherein the stem is inserted into the tubular housing and forms a valve body that is capable of opening and closing the exhaust passage;
• wherein the stem has a columnar body portion that extends in an axial direction of the tubular housing and a head portion that is capable of closing the exhaust passage by coming into contact with an inner surface of the opening portion of the tubular housing,
• wherein the urging member is capable of urging the stem towards the cavity so as to open the exhaust passage;
• wherein a top surface of the opening portion of the tubular housing is a flat surface and a top surface of the head portion of the stem is a flat surface,
• wherein, when the exhaust passage is closed, the top surface of the opening portion in the tubular housing and the top surface of the head portion in the stem are both recessed from the molding surface, and
• wherein an edge portion connecting an inner peripheral surface of the exhaust hole and the molding surface is formed by an inclined surface.