VEHICLE BATTERY MOUNTING STRUCTURE

An vehicle battery mounting structure includes a first frame member, a battery unit, a coupling portion, and a brittle portion. The first frame member supports a vehicle floor and includes a front portion, an inclined portion and a rear portion. The inclined portion extends rearward from a rear end of the front portion in a front-rear direction of the vehicle and upward from the rear end in a vertical direction of the vehicle. The battery unit is disposed under the vehicle floor. The coupling portion couples the battery unit to the inclined portion or a second frame member connected to the inclined portion. The brittle portion is provided at the coupling portion and releases the inclined portion or the second frame member from a connection with the battery unit when a forward load is applied to the coupling portion in the front-rear direction of the vehicle.