To provide a hydrogen gas generating apparatus capable of quickly generating hydrogen gas while forming a hydrogen generating unit housing a hydrogen generating agent in its case, and reliably exerting a check function additionally provided in the case so as to prevent a metallic ion from flowing out to drinking water.SOLUTION: A hydrogen gas generating space for housing a hydrogen generating agent is formed in a tightly closed cylindrical case which can be input into a PET bottle. A gas filling space blocked from the hydrogen gas generating space is formed at the ends of the hydrogen gas generating space. A small hole for discharging the gas is bored at the one end wall of the gas filling space. The hydrogen gas generating space and the gas filling space are made to communicate with each other via a thin check pipe of which openings at both ends open to both spaces.SELECTED DRAWING: Figure 4【課題】ケースに水素発生剤を収容した水素発生ユニットに構成しながら迅速に水素ガスの発生を可能とし、且つ、金属イオンが飲料水に溶出しないようにケースに付加構成した逆止機能を確実に果たし得る水素ガス発生装置を提供する。【解決手段】ペットボトル内に投入自在とした密閉状の筒状ケース内に、水素発生剤を収納するための水素ガス発生空間を形成すると共に、水素ガス発生空間の端部には水素ガス発生空間と遮断したガス充填空間を形成し、ガス充填空間の一端壁部にはガス放出用小孔を穿設し、水素ガス発生空間と充填空間とは両端開口部が各空間にそれぞれ開口した逆止細パイプを介して連通状態とした。【選択図】図４
