To provide a switch device capable of simultaneously controlling a change of the state in which electrically conducting pieces housed inside two contactors are opened or closed, so as to control a response between two products, thereby enhancing an amusing interactive reaction between the two products.

A switch device comprises two contactors 10. Each of the contactor 10 includes two or more electrically conducting pieces 1A, 1B, a magnetic material 19 and an elastic body 17. The electrically conducting pieces 1A, 1B and the magnetic material 19 are disposed by a direct or indirect method. When the contactors 10 approach to each other at a distance at which a magnetic action is generated between the magnetic materials 19, the always opened or closed state between the electrically conducting pieces 1A, 1B is converted into the always closed or opened state. When the two contactors 10 are separated from each other and therefore the magnetic action is dissipated, the inherently opened or closed state is restored between the electrically conducting pieces 1A, 1B by the elastic force of the elastic body 17.