BATTERY PACK AND ELECTRIC BICYCLE

To provide a battery pack that is less likely to be affected by vibrations, shocks and the like and has a stable characteristic, and an electric bicycle that uses the battery pack. A battery pack includes: battery connecting structures in which a plurality of flat batteries is placed; cushioning members that are disposed in two directions, which cross each other at right angles, of outer surfaces of the battery connecting structures; and a housing section that houses the battery connecting structures in such a way that clearance between outer surfaces of the cushioning members of one direction is positive, and that clearance between outer surfaces of the cushioning members of the other direction is negative.