A charging and discharging circuit, wherein the charging and discharging circuit charges input electric current to a plurality of capacitors, the charging and discharging circuit discharges output electric current from the plurality of the capacitors; the charging and discharging circuit comprises change-over switches which are switched to a series electric current state, in which the electric current flows to the plurality of the capacitors in series, and a parallel electric current state, in which the electric current flows to the plurality of the capacitors in parallel; the charging and discharging circuit comprises, apart from the change-over switches, a discharge switch configured to start a discharging of the output electric current from the plurality of the capacitors too, characterized by the following; the charging and discharging circuit comprises a series wiring which connects to the plurality of the capacitors in series; the charging and discharging circuit comprises intermediate diodes which are arranged between each set of adjacent two capacitors and are aligned in a forward direction from an anode to a cathode in the series wiring; the charging and discharging circuit comprises anode parallel wirings connecting each anode-capacitor interval between the anode side of the intermediate diode and the capacitor adjacent to the anode side, to a cathode end outside electrode which is positioned on the end of the series wiring and is positioned on the opposite side of the intermediate diode in a cathode end capacitor adjacent to only the cathode side of the intermediate diode; the charging and discharging circuit comprises cathode parallel wirings connecting each cathode-capacitor interval between the cathode side of the intermediate diode and the capacitor adjacent to the cathode side, to an anode end outside electrode which is positioned on the end of the series wiring and is positioned on the opposite side of the intermediate diode in an anode end capacitor adjacent to only the anode side of the intermediate diode; the charging and discharging circuit has a case that the change-over switches are arranged in the anode parallel wirings, diodes for parallel are arranged in a forward direction from the cathode-capacitor interval to the anode end outside electrode in the cathode parallel wirings, a case that the change-over switches are arranged in the cathode parallel wirings, diodes for parallel are arranged in a forward direction from the cathode end outside electrode to the anode-capacitor interval in the anode parallel wirings, or, a case that the change-over switches are arranged in the anode parallel wirings and the cathode parallel wirings. the charging and discharging circuit charges input electric current to a plurality of capacitors, the charging and discharging circuit discharges output electric current from the plurality of the capacitors; the charging and discharging circuit comprises change-over switches which are switched to a series electric current state, in which the electric current flows to the plurality of the capacitors in series, and a parallel electric current state, in which the electric current flows to the plurality of the capacitors in parallel; the charging and discharging circuit comprises, apart from the change-over switches, a discharge switch configured to start a discharging of the output electric current from the plurality of the capacitors too, characterized by the following; the charging and discharging circuit comprises a series wiring which connects to the plurality of the capacitors in series; the charging and discharging circuit comprises intermediate diodes which are arranged between each set of adjacent two capacitors and are aligned in a forward direction from an anode to a cathode in the series wiring; the charging and discharging circuit comprises anode parallel wirings connecting each anode-capacitor interval between the anode side of the intermediate diode and the capacitor adjacent to the anode side, to a cathode end outside electrode which is positioned on the end of the series wiring and is positioned on the opposite side of the intermediate diode in a cathode end capacitor adjacent to only the cathode side of the intermediate diode; the charging and discharging circuit comprises cathode parallel wirings connecting each cathode-capacitor interval between the cathode side of the intermediate diode and the capacitor adjacent to the cathode side, to an anode end outside electrode which is positioned on the end of the series wiring and is positioned on the opposite side of the intermediate diode in an anode end capacitor adjacent to only the anode side of the intermediate diode; the charging and discharging circuit has a case that the change-over switches are arranged in the anode parallel wirings, diodes for parallel are arranged in a forward direction from the cathode-capacitor interval to the anode end outside electrode in the cathode parallel wirings, a case that the change-over switches are arranged in the cathode parallel wirings, diodes for parallel are arranged in a forward direction from the cathode end outside electrode to the anode-capacitor interval in the anode parallel wirings, or, a case that the change-over switches are arranged in the anode parallel wirings and the cathode parallel wirings.