Rubber temperature measuring device and rubber product manufacturing method

A rubber product manufacturing method in which a molded article is disposed in a mold for vulcanization to vulcanize unvulcanized rubber that forms the molded article to manufacture a rubber product, the method comprising:

• biasing, by a biasing member disposed in an installation hole having an opening portion, the installation hole being formed in a molding surface of the mold, a temperature sensor disposed in the installation hole in a direction of projecting from the molding surface of the mold, whereby a temperature detecting unit at a tip end of the temperature sensor projects from the molding surface and is not in contact with the mold, the tip end of the temperature sensor having a greatest width of any portion of the rubber temperature measuring device disposed in the installation hole;
• installing the molded article in the mold and closing the mold and performing vulcanization in a state in which the temperature sensor is pressed by the molded article making contact with the temperature detecting unit against biasing force of the biasing member and the opening portion is blocked by the temperature detecting unit;
• and
• transmitting temperature data detected by the temperature detecting unit to outside the mold through a communication line extending into a communicating hole communicating with the installation hole, the communication line being connected to the temperature sensor.