In a fuel cell which includes a plurality of stacks in which a plurality of cells, which cause reaction gases to undergo electrochemical reaction and generate electricity, are stacked in layers; and an electrically conductive member which electrically connects together end portions of the stacks, so that the stacks constitute a series circuit, there is also provided a first relay which electrically connects together some cell other than one at an end portion of a stack, and a cell of another stack. This first relay can create a bypass for cutting out a cell whose cell voltage value has become less than or equal to a predetermined value from the series circuit of the fuel cell.