disclosed is a buckle comprising a first section including an engagement portion for engagement with a belt - like , flexible , adjustable fastening member and a latch portion , and a second section which is structured to detachably mate with said latch portion of said first section , said engagement portion being capable of pivotally moving to said latch portion . according to the present invention , irrespective of the direction of a pulling force applied to one end of the adjustable fastening belt engaged with the buckle , no such condition can be produced that the adjustable fastening belt is gradually loosened so that it is finally dropped off the buckle .