A charging circuit includes an oscillation transformer and an oscillation transistor. The oscillation transistor oscillates at a secondary current returned from a secondary coil in the charging circuit. The oscillation transistor increases/decreases a primary current, which flows from a battery to a primary coil, and flows the secondary current through the secondary coil to charge a main capacitor. The oscillation transistor, which satisfies the following conditions, is used: a DC current gain hFE1 is 50010 when a collector-emitter voltage VCE is 2V and a collector current IC is 0.5 A, and a DC current gain hFE2 is 29010 when the collector-emitter voltage VCE is 2V and the collector current IC is 5 A.

 
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