A hydrogen storage apparatus M stores a liquid hydrogen tank 1, hydrogen filling passage 3 that fills liquid hydrogen in to the liquid hydrogen tank, a degassing passage 4 provided with a relief valve V1 that opens when the pressure of hydrogen gasified in the liquid hydrogen tank reaches a predetermined level, and a hydrogen occlusive tank 2 that accommodates a hydrogen occlusive alloy 21 for storing the gasified hydrogen. When liquid hydrogen is being filled into the liquid hydrogen tank 1, the pressure in the hydrogen occlusive tank 2 is lowered using a duct 51, a cooling fan 52, and a conduit 54 for cooling the hydrogen occlusive tank 2. Accordingly, the filling time is shortened and the fuel efficiency is improved.