To provide a gas vessel transporting device for a storage warehouse storing filled LP gas vessels where carry-in and carry-out are performed on one side, in which gas vessels can be laid in rows from the side nearer the operator to the backmost in the storage space and it is possible to carry out in the sequence from the oldest one first and also to utilize the storage space effectively.

A gas vessel C placed on a pallet a in the carry-in part is transported by an X-direction transport part 1 to the backmost in the storage space D and is transported by another X-direction transport part 2 to the side nearer the operator of the storage space D to reach the carry-out part. Accordingly it is possible to carry out in the sequence from the backmost stored one first which is the oldest.