A drink filling system including: a bottle molding section; a sterilizing section that sterilizes a molded bottle; a rinsing section that rinses the bottle; a filling section that fills and seals the bottle; and a conveying unit that conveys the bottle from the molding section through to the filling section. A chamber covers a portion extending from the sterilizing section to the filling section, and an atmosphere shut-off chamber is provided between a sterilizing section chamber and a rinsing section chamber. An exhaust unit is provided for the atmosphere shut-off chamber and/or the sterilizing section chamber, a clean air supply unit is provided for a filling section chamber so that a clean air flows from the filling section chamber into the atmosphere shut-off chamber through the rinsing section chamber or further flows into the sterilizing section chamber, and the air-flow flowing therein is exhausted by an exhaust unit.