The invention provides a bicycle power supplying device configured to easily obtain the power needed to drive a subject electric component and a bicycle electric device that includes the bicycle powersupplying device. The bicycle power supplying device includes a holder and a power storage unit. The holder holds a dry cell so that the dry cell is attachable to and removable from the holder. The dry cell includes a body, a first electrode arranged on the body, and a second electrode arranged on the body. The power storage unit is configured to store power of the dry cell and supply the storedpower to a subject electric component.