A Josephson logic circuit includes a Josephson element inserted between an input terminal and a reference electric potential such as ground, a resistor inserted between the input terminal and an input of the next stage of the Josephson circuit, and a current source which supplies an offset current to the Josephson element. By adjusting the offset current, the Josephson logic circuit can be operated as an AND circuit, an OR circuit, or a majority logic circuit having a high input sensitivity.