A hydrogen supply apparatus includes a hydrogen supply path by which hydrogen released from a hydrogen tank reaches a hydrogen supply target, a branching path from the hydrogen supply path, in which a part of hydrogen released from the hydrogen tank flows, addition means for adding an odorizing agent to the hydrogen flowing in the branching path, a buffer tank storing the hydrogen to which the odorizing agent is added by the addition means, and supplying means for supplying the odorizing agent treated hydrogen in the buffer tank to the hydrogen supply path.