To solve a problem that, in a charge pump circuit that raises a voltage in a small step of a power source voltage Vdd or smaller, forward bias is applied to a parasitic diode and that the circuit malfunctions.

This charge pump circuit is provided with at least first and second charge transferring MOS transistors M1, M2 connected in series, a clock driver 3 that supplies a clock to first and second capacitors 1, 2 and the one end of the second capacitor 2, a first switching means S2 for connecting the first and second capacitors 1, 2 in series to a pumping node, and second switching means S1, S3 for connecting the capacitors 1, 2 parallel to the node. Then, the clock driver 3 changes the clock state when both of the first and second switching means are turned off.