To provide a double packaging bag which has an inner packaging bag containing a material, which inner packaging bag is stuck and fixed to the inner surface of an outer packaging bag, and does not break during transportation or loading work but easily breaks under a push for use to transfer the material to the outer packaging container or mix the material into a material contained in the outer packaging box for use.

The double packaging bag is composed of the inner packaging bag which contains the material hermetically and is sealed with a strength that allows much easier separation of the seal that the inner packaging bag breaks easily under a push, and the outer packaging bag which at least contains the inner packaging bag hermetically and hardly breaks under a push. A fixing part is formed on a part of the outermost layer of the inner packaging bag, where the fixing part is stuck closely and fixed to the innermost layer of the outer packaging bag. With the fixing part, the inner packaging bag is stuck closely and fixed to the innermost layer of the outer packaging bag.