PURPOSE: To get a small buckle which can be handled well and provide a stable connection and a smooth disconnection.

CONSTITUTION: A buckle is constituted of a male member 10 and a female member 20. Fixing ends 15a, 15b of elastic protrusions 12a, 12b of the male member 10 and auxiliary fixing edges 13a, 13b are unified with fixing parts 28a, 28b of cage 22 of female member 20 and auxiliary fixing parts 25a, 25b. When the outside of the elastic protrusions 12a, 12b of the male member 10 are pressed until both front ends of the elastic protrusions 12a, 12b are moved mutually, these are elastically deformed to the mutually opposite directions which cross in almost right angles with the pressing direction and respective connections are unfixed and these are separated from each other. In this way, a small buckle can be obtained without any complicated structure and a stable connection state can be obtained without any complicated manipulation. And further, it also can smoothly be disconnected.