Note outlet plug

PROBLEM TO BE SOLVED: To provide a spout plug on the internal surface of which, an excellent barrier material is pasted, and which is favorably fitted in a spout plug fitting hole on the top section of a paper container for a liquid by an ultrasonic welding. SOLUTION: This spout plug is fitted in the spout plug fitting hole on the top section of the paper container for a liquid through a flange section of the spout plug by the ultrasonic welding. The spout plug comprises a seating on the outer peripheral edge section of which, the flange section to be fitted in the spout plug fitting hole at the top section of the paper container for the liquid by the ultrasonic welding is extended. In addition, a discharging cylindrical section which is erected from the upper section on the inner periphery of the seating is provided. Also, a sealing plate section having a tab, which is opened by tearing an annular score section in the lateral direction on the inner periphery of the seating is provided. In addition, at least on the internal surface wall section on the side coming into contact with a content of the seating which constitutes the spout plug, the barrier material comprising a barrier film containing a nylon MXD6 resin is insert-molded, and fixed.