Abstract: To supply a strap buckle that can be formed in an inexpensive mold, that has a miniaturized and simplified structure and thus is expensive, and to which a belt, etc., formed into a loop can be attached easily, such that male part 1 is composed of push-through ring 10 for belt attachment and insertion part 7; aforementioned insertion part 7 is composed of slit 9 that bifurcates it and two catching pieces 6, 6 that are folded back and outwardly from the ends of thereof; female part 2 is shaped approximately like a rectangular cylinder; male part insertion hole 3 is provided at one end in the longitudinal direction and loop cord mounting hole 12 is provided at the other end; and catch-receiving side hole 4 is provided on its side 8 and catch-receiving projection 5 of male part catching piece 6 is provided on both sides, on the insertion hole 3 side.