BATTERY UNIT

This battery unit S includes a plurality of batteries , and a storage part which is fixed between a plurality of frames of a vehicle A and stores the plurality of batteries , wherein each of the batteries has a plurality of battery cells , a fixing part for fixing the plurality of battery cells to the storage part , and an elastic member which is provided to the fixing part and inhibits stress from being generated in the batteries due to force applied from the plurality of frames . The plurality of battery cells are arranged side by side in the horizontal direction of the vehicle A, and the elastic member expands/contracts in the height direction of the vehicle A orthogonal to the horizontal direction.