A power feeding side connector (electrical connector) has a locking lever adapted to lock together the power feeding side connector and a power receiving side connector at the time of engagement therebetween, a microswitch adapted to detect halfway fitting of the locking lever to interrupt electrical conduction, and a release lever adapted to release locking by the locking lever after charging. In the halfway fitting state, an intermediate portion of the locking lever is brought into contact with a spring piece of the microswitch to push it so that normally-closed contacts of the microswitch are opened to interrupt electrical conduction.