A refueling station 11 is provided below an exposed deck, and bunker manifolds 12 are housed therein. An airlock space 13 is provided adjacent to the refueling station 11. A subspace 16 is provided adjacent to the airlock space 13. A vehicle loading zone 10 is formed on the outside of the refueling station 11, the airlock space 13, and the subspace 16. A first gastight door 21 can seal a first entrance 15 for movement between the refueling station 11 and the airlock space 13. A second gastight door 22 can seal a second entrance 18 for movement between the airlock space 13 and the subspace 16.A third gastight door 23 can seal a third entrance 20 for movement between the subspace 16 and the vehicle loading zone 10. An opening 31 is formed in the subspace 16.