The present invention relates to a bipolar battery. It is an object of the present invention to provide a bipolar battery having a good productivity and a high reliability of the electrical connection with an apparatus when the battery is attached to various apparatuses. A bipolar battery 1 of the present invention includes a positive electrode 10, a negative electrode 11, a bipolar electrode 12, an electrolyte-containing separator 13, and a sealing member 14. Current collectors 20, 22, and 24 of the positive electrode 10, the negative electrode 11, and the bipolar electrode 12 are respectively provided with at least two projections 20a to 20d, 22a to 22d, and 24a to 24d, and these projections project from peripheral portions of the current collectors.