A battery storing device may include: a case member having a positive terminal and a negative terminal and configured to store a battery therein; a positive pole coil spring in contact with a positive electrode of the battery; a negative pole coil spring in contact with a negative electrode of the battery; and a first support comprising a sidewall support section having an elastic force that is able to fix the battery while absorbing a size difference of the battery allowed according to a standard, and configured to support a sidewall of the battery.