Problem to be solved: to provide a gas generating container, a gas generating package, and a gas generating method capable of suppressing the complication of the configuration.Solution: there are provided a cylindrical side portion 10 surrounding the side of the reaction space, and a body part 2 having a bottom portion 20 for closing one of the two openings of the side opening 10, and a lid part 4 for closing the other opening of the side part 10, and a lid part 4. A first opening 42, which is in communication with the reaction space and is capable of passing through the gas generating liquid, is formed in the top face 40 facing the bottom portion 20 in the closed state in the closed state, and is disposed on the outer peripheral side of the lid portion in the lid part 4 in the plan view of the closed state in the plan view of the closed state. ReactionA second opening 44 capable of passing the gas generated by reaction of the gas generating agent and the gas generating solution in the space is formed, and after the gas generating agent is loaded into the bottom portion 20, the reaction space is formed, and the first opening 42 is passed through the gas generating liquid, and the gas generating agent is countered. The generated gas is exhausted from the second opening 44.Diagram【課題】構成の複雑化を抑制することが可能な、ガス発生容器、ガス発生パッケージ、ガス発生方法を提供する。【解決手段】反応空間の側方を包囲する筒状の側面部10と、側面部10が有する二つの開口部のうち一方の開口部を閉塞する底面部20を有する本体部2と、側面部10が有する他方の開口部を閉塞する蓋部4を備え、蓋部4が有する、閉塞状態で底面部20と対向する天面部40に、反応空間と連通し、且つガス発生液が通過可能な第一開口部42が形成され、蓋部4に、閉塞状態の平面視で天面部よりも蓋部の外周側に配置され、且つ反応空間でガス発生剤とガス発生液が反応して発生したガスが通過可能な第二開口部44が形成されており、底面部20にガス発生剤を載せた後に反応空間を形成し、第一開口部42にガス発生液を通過させてガス発生剤と反応させて発生させたガスを第二開口部44から排気する。【選択図】図1