Portable gas supply device

A portable gas supply device comprising:

• a battery;
• a control board for controlling power supply from the battery;
• a pair of positive/negative electrodes to which power from the battery is supplied or blocked by the control board;
• an electrolysis tank capable of storing water, the electrolysis tank into which the pair of positive/negative electrodes are inserted;
• a permeation device through which only a predetermined gas inside the electrolysis tank can permeate;
• and
• a nozzle capable of supplying a gas emitted from the permeation device,
• wherein the permeation device has a first permeable membrane and a second permeable membrane in order from an upstream with the electrolysis tank side as the upstream, the first permeable membrane blocking an opening of the electrolysis tank, the first permeable membrane allowing only a predetermined gas to permeate through the first permeable membrane, the second permeable membrane being disposed so as to be spaced a predetermined distance apart from the first permeable membrane, the second permeable membrane allowing only the gas that has permeated through the first permeable membrane to permeate through the second permeable membrane.