An embodiment of an electrical connecting apparatus comprises a support board, a plate spring arranged on the support board, an attachment device attaching the plate spring to the support board, a block having an attachment surface directing downward, and a flexible circuit board in which a plurality of contactors are arranged. As for the block, the attachment surface for attaching the circuit board is protruded further to the lower side than the support board. The plate spring receives initial load to bring a state where at least a center area for attaching the block is biased toward the upper side. Thus, a good electrical contacting state can be obtained without increasing the overdriving amount.