PURPOSE: To assuredly release a high pressure gas to the outside of a sealed bag by a method wherein a valve label for gas-purging, which is attached to a sealed bag containing coffee beans, etc., which generate a small amount of gas during storage, is constituted in such a manner that an area between a coating layer and base film is made a gas-discharging passage to release a high pressure gas to the outside.

CONSTITUTION: A cover film 4 is laminated with an adhesive layer on the upper surface of a square base film 2 on which a vent hole 2a communicating with a gas-purging hole of a sealed bag is provided at the center. Then, at both side parts of the cover film 4, confronted two sheets of reinforcing sheets 5 are laminated to constitute a specified gas-purging valve label 1. When the internal pressure of the sealed bag is approx. equal to the atmospheric pressure, a coating layer 7 which is applied on the surface of the adhesive layer joins to the base film 2, and a gas-discharging passage 8 is closed. But when a high pressure gas generates, the gas pushes up the adhesive layer and cover film 4 from the vent hole 2a, and the joined condition between the base film 2 and coating layer 7 is released, and the gas is discharged through the gas-discharging passage 8.