Abstract: The coupler includes a male coupler formed with an annular groove, and a female coupler into which the male coupler is detachably inserted. The female coupler includes a first body part downwardly open, a second body part upwardly open, being rotatably connected with the first body part, and defining a hollow space together with the first body part, and a guide housed in the space, and supporting the male coupler inserted into the female coupler. The guide is composed of a material having elasticity, and exerts an elastic force on the first body part and the second body part such that they are closed to each other.

Abstract: The coupler includes a male coupler formed with an annular groove, and a female coupler into which the male coupler is detachably inserted. The female coupler includes a first body part downwardly open, a second body part upwardly open, being rotatably connected with the first body part, and defining a hollow space together with the first body part, and a guide housed in the space, and supporting the male coupler inserted into the female coupler. The guide is composed of a material having elasticity, and exerts an elastic force on the first body part and the second body part such that they are closed to each other.

Abstract: A magnetic connecting device, which is easily separated without both hands but one that is not easily separated in a direction in which a pulling force is applied, is disclosed. Each of a pair of coupling pieces is respectively provided with each of a pair of coupling piece main bodies including joint surfaces capable of joining each other. At least one magnet piece is embedded in each of the joint surfaces such that the coupling piece main bodies attract to join each other. An attaching piece for attaching a string body is provided on each of the coupling pieces, and is provided with a slide guide structure formed on a side of the joint surface of each of the coupling piece main bodies for slidingly guiding the other in a predetermined direction with respect thereto.

Abstract: A clasp in which magnetic leakage is reduced includes a pair of pieces which are to be engaged with each other. Both pieces, when being engaged, both may rotate about an axis common to both pieces. Both pieces are provided with a pair of permanent magnets held in both pieces. Both permanent magnets have front and rear surfaces in which multiple poles are magnetized, and when both pieces are engaged, the front surfaces of both permanent magnets face each other.

Abstract: The clasp for jewelry includes a body, a pin insertable into the body, a stopper engaging to the pin having been inserted into the body to keep the pin engaged to the body, and a releaser releasing the pin from the body. When pulled or slid, the releaser releases the pin from the body.

Abstract: A clasp for jewelry includes a body, a pin insertable into the body, a stopper engaging to the pin having been inserted into the body to keep the pin engaged to the body, and a releaser releasing the pin from the body. The releaser and the stopper are arranged to the body through a single part disposed in the body.

Abstract: The clasp for jewelry includes a body, a pin insertable into the body, a stopper engaging to the pin having been inserted into the body to keep the pin engaged to the body, and a releaser releasing the pin from the body. When pulled or slid, the releaser releases the pin from the body.

Abstract: A clasp for jewelry includes a body, a pin insertable into the body, a stopper engaging to the pin having been inserted into the body to keep the pin engaged to the body, and a releaser releasing the pin from the body. The releaser and the stopper are arranged to the body through a single part disposed in the body.