There is provided a vehicle battery pack protective structure which protects a vehicle battery pack including battery stacks disposed in a width direction of a vehicle. The structure includes: a battery pack storage container that stores the vehicle battery pack; and a first upper reinforcing member that extends in a front-rear direction of the vehicle between the battery stacks, and is connected to the battery pack storage container at a front end and a rear end. A first fragile part is formed below an intermediate position of the first the upper reinforcing member.