To discharge liq. content while regulating amount of the liquid, to rapidly and surely return the dripped liq. content into a liquid receiving part and to improve sanitariness, appearance and usability of the mouth by inserting a stopper main body with a communication channel for returning the liq. content retained in a liq. receiving part into the container into the mouth of the container with air back function.

A stopper main body 3 comprises an inner cylindrical body 4 and an outer cylindrical body 5 and is inserted into a mouth 2 of a container 1. A wall body 12 is stood on the outer periphery of the top part of the outer cylindrical body 5 and a liq. receiving part 15 is formed between this wall body 12 and a nozzle part 6 of the inner cylindrical body 4. In addition, a communication channel 14 is formed suspendedly in the container 1 from the bottom end of this liq. receiving part 15. Therefore, when the container 1 is erected after the liq. content is discharged from the mouth 2 by pushing the container 1, dripped liq. content is retained in the liq. receiving part 15. Then, when pushing the container 1 is released, the sagged liq. content retained in the liq. receiving part 15 is rapidly and surely sucked into the container through the communication channel 4 by suction force by means of air back function of the container 1.