A simple light-weighten buckle including a male member having an inserting piece, a female member having an insertion port and a cover body storing the female member therein, wherein the inserting piece has a pair of concave engaged parts, the female member is formed of one elastic metal wire and has a base, a pair of arms that are bent and extend from respective ends of the base, a pair of bent parts provided in the middle of the respective arms, and a pair of engaging parts provided at respective front ends of the pair of arms, and the cover body has a cover main body, an insertion hole the inserting piece, a storage part that communicates with the insertion hole and stores the female member therein, and operating parts that can press the pair of respective bent parts inward from the outside of the cover body.