To inexpensively provide a cushioning bag capable of protecting a content from external pressure and exhibiting a beautiful appearance without executing lamination processing.SOLUTION: A cushioning bag 1 is a double bag comprising an outer bag 2 having a trunk which includes a first base material 91 and an inner bag 3 having a trunk which includes a second base material 92 and disposed inside the outer bag 2. The cushioning bag 1 includes a storage part S1 provided inside the inner bag 3, and a partition seal part 7 having a thermal adhesive part H1 of an inner surface of the first base material 91 and an outer surface of the second base material 92 and provided to a region facing the storage part S1. The partition seal part 7 forms a plurality of gas cells 10 between the first base material 91 and the second base material 92, and...