To facilitate the air extraction in a bag and seal up a chuck part surely after air extraction by forming a holding groove for holding the chuck part of a bag with a chuck from both sides on the tip end of an openable/ closable clip main body and penetrating this holding groove and inserting the pipe of an air extraction pump.

At the air extraction of the bag S with a chuck, at first a holding main body 2a, 2a is opened by picking the clip main body 2 of an air extraction pump 1 and a pipe 3b is positioned so as to be inserted in the bag S from the upper side of the bag S opened in advance. The grip main body 2 is loosened and a chuck part is held by a holding groove 2a1 at the point of time when the holding groove 2a1 reaches the chuck position. Thereafter, the air extraction pump 3 is operated and the air in the bag S is extracted. After extracting the air, the pipe 3b is extracted from the bag S by pulling up the air extraction pump 3 and a push-press pin 4a is pushed out by the spring 4b force of a seal up tool 4 and the chuck part is sealed up at the point of time when the pipe 3b passed the chuck part.