Magnesium-air fuel cell and power supply device using the same

A magnesium-air fuel cell having a height direction and a width direction, the magnesium-air fuel cell comprising:

• a main body;
• an anode body positioned in the main body;
• and
• cathode bodies positioned on both sides of the anode body in the width direction,
• wherein
• the main body includes, in an inner portion, a pair of cathode accommodating portions each extending in the height direction and having at least one end opened,
• the cathode bodies are each disposed in a corresponding one of the cathode accommodating portions, while having a part exposed to the inner portion, and
• the part of each of the cathode bodies is separated from and faces the anode body in the width direction, and
• wherein
• each of the cathode accommodating portions includes:
• first and second opening ends communicated with each other in the height direction;
• and
• an inner frame portion positioned on a side facing the anode body, and
• the cathode body disposed in said each of the cathode accommodating portions has a plate shape and is disposed on the inner frame portion.