According to the present invention, a battery includes: a cylindrical battery case; and an electrode body disposed in the battery case, and including a positive plate, a negative plate, and a separator disposed between the positive plate and the negative plate. A spacer formed of a dense body and an electrolyte storage space storing an electrolyte are provided between the electrode body and the battery case on one end or both ends of the battery case in an axial direction of the electrode body. Thus, a battery of high energy density and a long life, in which the unsteadiness of the electrode body in the battery case can be suppressed, can be provided at low cost.