The negative electrode current collector 6 is made of, for example, a metal material, such as gold, platinum, aluminum, or an alloy thereof. The negative electrode current collector 6 may have any shape, such as a sheet or a film. The negative electrode current collector 6 can be a porous or nonporous sheet or film. Examples of the sheet or film include foil and mesh. Aluminum and alloys thereof are inexpensive and can be easily formed into a thin film. The negative electrode current collector 6 can be made of carbon-coated aluminum. The thickness of the negative electrode current collector 6 is, for example, 1 to 30 μm. If the negative electrode current collector 6 has a thickness within this range, the strength of the current collector can be more certainly secured. For example, the current collector is prevented from being cracked or broken, and the energy density of the battery 1 can be more certainly secured.

The negative electrode current collector 6 can have a negative electrode terminal.

The fluoride ion secondary battery of the embodiment may include any member and have any structure other than those described above as long as the battery can be charged and discharged and can be used as a secondary battery.

The fluoride ion secondary battery of the embodiment may have any shape. The shape can be a shape of a known secondary battery. Examples of the shape include rectangular, circular, elliptical, and hexagonal shapes. The fluoride ion secondary battery of the embodiment may have a structure in which the battery (or single battery) exemplified in FIG. 1 is further stacked or is folded. In such cases, the fluoride ion secondary battery of the embodiment can have various battery shapes, such as cylindrical, square, button, coin, and flat shape.