A charge pump circuit includes a constant current circuit configured to have one terminal connected with a power source node; a first node configured to input or output a current; a second node configured to be set to have a potential difference with the first node being less than or equal to a predetermined value; a first transistor configured to have one terminal connected with the first node; a second transistor configured to have one terminal connected with the second node, and to operate inverse to an operation of the first transistor; and a third transistor configured to be connected between a connection node, to which another terminal of the first transistor and another terminal of the second transistor are connected, and another terminal of the constant current circuit. The third transistor has a gate connected with a constant voltage source, and functions as a constant current source.