PURPOSE: To insert a connector without interference with a printed board by providing a contact part composed by peeling one side end part of an insulating film and a stiffening plate being stuck to the insulating film on the opposite side surface to the contact while having projections on both sides.

CONSTITUTION: In an FPC holding both sides of a conductor 6 between the insulating films 4, 5, one side end is peeled to provide a contact 1. Since the FPC 8 is structutally apt to be bent while being short of strength at the part of a contact 1 and unable to be inserted into a connector, a contact reinforcing plate 7 is attached in the sense of reinforcement. Then, the insertion auxiliary holes 2, 3 are provided on both sides of this contact reinforcing plate 7. The FPC connector 10 is the connector to join the FPC 8 with the printed board 9. The FPC 8 can be inserted into the FPC connector 10 straight, with applying no unreasonable force.