The present invention is to provide an electric supply apparatus having a wiring harness bent freely in a protector and prevented from outer interferences or rain water. An electric supply apparatus having a wiring harness includes a protector, a leaf spring disposed in the protector and a spring holder fixed to the leaf spring, wherein the spring holder holds one end portion of a flexible protective member of the wiring harness and one end portion of a rigid protective member of the wiring harness, and wherein the flexible protective member is disposed along the leaf spring and the rigid protective member is arranged from the spring holder to an opening for leading out the wiring harness. The flexible protective member has an insertion member at the one end portion, the insertion member is resin-molded with the flexible protective member and fixed to one side portion of the spring holder. The spring holder has protrusions penetrating into the flexible protective member and engaging with grooves of the rigid protective member.