A buckle includes a male member (A) and a female member (B). The male member (A) includes: a base (10); a pair of legs (20) that project from the base (10); engaging portions (30) that are provided on the legs (20) to be engageable with the female member (B); and a linking body (40) that links the pair of legs (20). The linking body (40) includes a curved portion (42) that is curved such that the middle thereof is closest to the base (10). A pair of projecting portions (50) that are substantially parallel with an insertion direction of the male member (A) extend from the base (10) to be disposed outside the curved portion (42) such that the curved portion (42) is interposed therebetween. With this arrangement, the linking body for linking the pair of legs can be disposed with less possibility that other objects are caught in a space in the male member and without increasing a length dimension in the insertion direction more than necessary. The male member can be stably held relative to the female member against a torsion force.