Patent ID: 7155785

Claim:
A buckle device comprising: a buckle body that includes a bottom plate formed in a long plate-like shape and a pair of side walls extending from both width-direction ends of the bottom plate, with a tongue plate being inserted and retained between the pair of side walls from one longitudinal-direction end of the bottom plate, and with elongated holes along an insertion direction of the tongue plate being formed in the pair of side walls; and a release button that includes an operation portion that is disposed on the one longitudinal-direction end of the buckle body such that it is movable along the insertion direction of the tongue plate and which is push-operated along the insertion direction, and a pair of arm portions that extend from both width-direction ends of the operation portion in the insertion direction, wherein the operation portion is push-operated to release the retention of the tongue plate, and wherein the release button further includes a pair of extension portions that have a predetermined elasticity and extend from respective width-direction ends of the pair of arm portions toward the bottom plate; pawl portions that protrude from respective ends of the pair of extension portions toward each of the side walls and movably fit into the elongated holes, and a coupler portion that spans the distance between, and couples together, the ends of the pair of arm portions, such that the rigidity of the arm portions is increased and the elasticity of said extension portions is stiffened.