An in-vehicle hydrogen storage apparatus (1) has a hydrogen gas filling passage (8) connected from a hydrogen gas filling port (6) up to the storage device (7) that stores a hydrogen gas to be supplied to a fuel cell (2), and an odorizing agent supplying device (12) that supplies an odorizing agent to hydrogen gas in at least one of the inside of the storage device (7) and the inside of the hydrogen gas filling passage (8).