Liquefied hydrogen storage tank

A multiple shell liquefied hydrogen storage tank for storing liquefied hydrogen, the liquefied hydrogen storage tank comprising:

• an inner tank including an inner tank roof and an inner tank side plate to define a storage space for the liquefied hydrogen;
• an intermediate tank including an intermediate tank roof above the inner tank roof and an intermediate tank side plate outside the inner tank side plate;
• an outer tank that houses the intermediate tank inside the outer tank,
• a heat insulation space including a roof space part between the inner tank roof and the intermediate tank roof, and a side space part between the inner tank side plate and the intermediate tank side plate;
• a heat insulation material disposed in the heat insulation space;
• a communication pipe that penetrates the inner tank roof;
• and
• a gas passage provided in the roof space part to allow gas to flow between an upper opening of the communication pipe and the side space part.