Abstract: There is provided a buckle including a plug and a socket. The plug includes a plug-side base part, a pair of leg parts, and a pair of engagement protrusions. The socket includes a socket-side base part, an upper plate, a lower plate, upper side wall parts, lower side wall parts, engagement stepped portions, slits, and guide surfaces. A dimension of the pair of engagement protrusions in the upward and downward direction is set to be greater than a dimension of each of the slits in the width direction.

Abstract: A piping slider includes: a cavity in which a pipe-shaped part of an adherend is accommodatable; a slit that intercommunicates the cavity with an outside; a connector to which a belt is connected; a grip member in which the cavity and the slit are provided; a key member insertable into the slit; and a lock mechanism that restricts a displacement between the key member and the grip member when the key member is inserted into the slit, where an opening width of the slit is greater than a minimum width of the pipe-shaped part, and an opening width when the key member is inserted to the slit is smaller than the minimum width of the pipe-shaped part.

Abstract: There is provided a buckle including a plug and a socket. The plug includes a plug-side base part, a pair of leg parts, and a pair of engagement protrusions. The socket includes a socket-side base part, an upper plate, a lower plate, upper side wall parts, lower side wall parts, engagement stepped portions, slits, and guide surfaces. A dimension of the pair of engagement protrusions in the upward and downward direction is set to be greater than a dimension of each of the slits in the width direction.

Abstract: A flat belt attachment includes a first bar that connects corresponding positions of a pair of base bars facing each other; and a second bar that is parallel to the first bar and connects the base bars. The second bar includes a second inclined portion at an end portion, and the second inclined portion is shaped to approach the first bar toward a proximal end of the second inclined portion.

Abstract: A piping slider includes: a cavity in which a pipe-shaped part of an adherend is accommodatable; a slit that intercommunicates the cavity with an outside; a connector to which a belt is connected; a grip member in which the cavity and the slit are provided; a key member insertable into the slit; and a lock mechanism that restricts a displacement between the key member and the grip member when the key member is inserted into the slit, where an opening width of the slit is greater than a minimum width of the pipe-shaped part, and an opening width when the key member is inserted to the slit is smaller than the minimum width of the pipe-shaped part.