<p>This DC power source device is provided with: a rectifier circuit (5) that rectifies AC voltage from an AC power source (1); a switching unit (4) that turns on/off the AC voltage from the AC power source (1) via an inductor (2); a smoothing capacitor (6) provided to the output side of the rectifier circuit (5); a first current detection unit (3) that detects current input from the AC power source (1); and a second current detection unit (7) that detects current flowing in the direction that charges the smoothing capacitor (6) when the switching unit (4) is off. A control unit (8) detects an imbalanced state of the input current using difference information of the absolute values of the current values detected by the first current detection unit (3) and the second current detection unit (7) when the switching unit (4) is off.</p>
