Charging Apparatus for Secondary Battery

A charging apparatus for a secondary battery comprises: a power supply circuit connected to a primary winding 11a of a transformer T1; a main winding 11b and a sub winding 11c connected to a secondary side of the transformer T1; a charging circuit 110 connected to the main winding 11b, the charging circuit 110 supplying power to a battery pack 130 to be charged; and a control circuit 120 connected to the sub winding 11c, the control circuit 120 controlling the charging circuit 110, wherein the charging circuit 110 comprises a LED 140 indicating a standby state or a charge completion state, the LED 140 being lighted at light-load time of the charging circuit 110 based on a command of the control circuit 120.