Provided is a buckle including a plug member and a socket member. The plug member includes a plate extending forward from a lower end of a base and having a first magnet embedded in a middle portion thereof, and a holder protruding from a front end of the plate. The socket member includes an upper plate extending forward from an upper end of a base and having a second magnet embedded in a middle portion thereof, side plates formed on opposite sides of the upper plate, and a accommodation region formed inside the upper plate and the side plates so as to accommodate the plate therein. The upper plate has a holder aperture formed therein so that the holder is seated in the holder aperture when the plug member and the socket member are coupled to each other.