To appropriately hold a pressure vessel at a normal time, while buffering external force caused by an impact, etc. received by the pressure vessel, to the pressure vessel and a bracket, thus reducing the load thereon.

A support structure includes the pressure vessel 10a and brackets 50, 60 for holding end parts in a longitudinal direction of the pressure vessel 10a and mounting the end parts to side members 110a, 110b. The brackets 50, 60 include mounting members 34, 44, holding members 32, 42 and external force absorbing members 55, 65, respectively.