PURPOSE: To realize connector connection excellent in assembling workability at a low cost without necessitating a reinforcing sheet, by a method wherein a pattern part for connector connection is folded back and the insertion part of a flexible printed board into the connector is made double.

CONSTITUTION: A plurality of terminal patterns 9 for connector connection are formed on one end side of a flexible printed board 8 of connection side. A stretched part 8a is formed on the further end side of the terminal patterns 9. At the time of connector connection, the stretched parpt 8a is folded back on the side opposite to the surface on which the terminal patterns 9 are formed, and the printed board is connected with a connector. Thereby necessary contact pressure can be ensured without sticking a reinforcing sheet serving as a spacer.