An object of the present invention is to provide a fuel cell temperature distribution control system, a fuel cell, and a temperature distribution control method that can improve the power generation output by optimizing the operating conditions. A fuel cell having a cell stack having a power generation unit for generating electricity by reacting an oxidizing gas flowing through the anode side and a fuel gas flowing through the anode side in a fuel cell cell in which the cathode, the solid electrolyte, and the anode 109 are stacked ( 313) is a temperature distribution control system, and based on the measurement result by the temperature measurement unit and the temperature measurement unit for measuring the temperature of the fuel gas supply unit in the power generation unit, the temperature of the fuel gas supply unit is within a preset appropriate temperature range. By controlling, the control unit which controls the temperature distribution state in the fuel gas flow direction in the power generation unit is provided.
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