To provide a circuit which generates a highly accurate reference voltage without being affected by variation of elements.

The circuit includes: means which causes currents having different current densities to flow to semiconductor junctions; means which charges a voltage proportional to a difference voltage to a parallel connection of a plurality of capacities; means which connects the capacities in series to generate a voltage; means which charges a voltages of the semiconductor junctions to the series connection of the plurality of capacities when necessary; means which connects the capacities in parallel to generate a voltage proportional to the voltage of the semiconductor junctions; and means which adds this voltage and the former generated voltage. The difference voltage is a difference between a voltage which is generated by causing a constant current to flow to a parallel connection of a first number of semiconductor junctions or constant current sources out of the plurality of semiconductor junctions or a plurality of constant current sources and a voltage generated by connecting a second number of semiconductor junctions or constant current sources in parallel, and if necessary, a plurality of combinations are successively selected when the first number and the second number are selected.