Buckle

A buckle comprising a pair of plugs mounted to each of end portions of a pair of straps, a socket mounted to an end portion of another strap, a strap attaching portion formed at a base portion of each of said plugs, a tongue formed to project from each said strap attaching portion and to be inserted into said socket, an engaging portion formed at a tip end portion of each said tongue, inserting portions which are formed in said socket to penetrate said socket and to face each other and into which said tongues are inserted respectively, fixed engaged portions which are formed in said inserting portions and with which said engaging portions of said plugs are engaged, and an operating portion which is formed between said engaged portions and which displaces said engaging portions to disengage engagements of said engaging portions with said engaged portions, wherein said operating portion is formed separately with said socket and comprises a release button exposed to an outer surface of an operating hole of said socket, pushing portions integrally formed on a rear face side of said release button, and a locking portion to be locked in said socket to prevent disengaging from said socket, a resilient portion is formed on at least one of said release button and said socket so as to abut on the other of said release button and said socket and to bias said operating portion outward.