A leg portion is provided at a second connector so that a gap is created between a flat circuit body and a circuit board. The leg portion also serves as a positioning projection, and a locking hole for being engaged with the positioning projection is provided at the flat circuit body. A guiding groove for receiving the leg portion is formed at a first connector. A guiding part for receiving the first connector in a sliding manner is formed at an end of an opening of the first connector, and an inclined part for sliding the guiding part there along is formed at an end of an engaging part of the second connector.