Cap sterilization device and content filling system

A cap sterilization device comprising:

• a sterilant spraying chamber in which a sterilant is sprayed onto a cap;
• an air-rinsing chamber in which the cap onto which the sterilant has been sprayed in the sterilant spraying chamber is subjected to air-rinsing, and
• a conveying chute along which the cap that has been subjected to air-rinsing is conveyed downstream,
• wherein a sterilant spraying wheel that conveys the cap while rotating the cap is disposed in the sterilant spraying chamber,
• wherein an air-rinsing wheel that conveys the cap onto which the sterilant has been sprayed while rotating the cap is disposed in the air-rinsing chamber,
• wherein the air-rinsing chamber is disposed vertically above the sterilant spraying chamber,
• wherein the conveying chute is provide with a stopper that is capable of being opened and closed, and
• wherein the stopper is positioned so that the conveying chute is capable of accommodating all of the caps in the sterilant spraying chamber and the air-rinsing chamber when the stopper is closed.