US Patent 7650675 Buckle

A buckle includes a plug 2 and a socket 3 connected to each other in a predetermined connecting direction. The plug 2 includes a tongue-like portion 22 and a first projected portion 23 projected from the tongue-like portion 22 in a thickness direction crossing to the connecting direction and having, thereon, a first locked face 24. The socket 3 includes an insertion hole 32 and a first stepped portion 33 formed at the insertion hole 32 and having, thereon, a first locking face 34 engaged with the first locked face 24. The buckle also includes second projected portions 25 projected from both side faces of the tongue-like portion 22 in a width direction crossing to the connecting direction and the thickness direction, second locked faces 26 formed on base end side faces of the second projected portions along the width direction, and a second stepped portion 35 formed at the insertion hole 32 and having, on its base end side faces, second locking face 36 formed along the width direction and engaged with the second locked faces 26.