To reduce manufacturing costs, without using a special valve, compared to a degassing bag body using a conventional degassing tape.SOLUTION: A degassing bag body 1, in which first and second sheet parts having heat adhesive layers are heat-sealed by fusion of the heat adhesive layer each other, has an opening part in an upper end side. The degassing bag body 1 comprises a thread 41 which forms an air passage for communicating an internal space of the degassing bag body 1 and an external space of the degassing bag body 1. A portion near one end part of the thread 41 is held by being surrounded with the heat adhesive layer, between the first and second sheet parts.SELECTED DRAWING: Figure 1

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