To provide high quality slide type or rotation type electronic equipment whose scale reduction, thickness reduction, weight reduction, and cost reduction can be achieved by reducing components, and which includes an opening/closing mechanism for securing long term stable opening/closing and maintaining functions and an opening/closing state detection function.

Two casings are piled up, and connected so as to move sliding by linear movement or rotational movement, and the opposite faces positioned at the overlapped part of the casings are brought into contact with each other, and when the casings are put in such a state that the opposite faces are not exposed, that is, the closed state that the casings are closed, the closed state is maintained, and being the closed state is sensed by a magnet 4 arranged on one upper casing 1 and a first magnetic substance 5 and a magnetic sensor 7 arranged on the other lower casing 2. Also, when the casings are made to move sliding, and put in such a state that the opposite faces are exposed, that is, the opened state that the casings are opened, the opened state is maintained by the second magnetic substance 6 and the magnet 4 arranged on the other lower casing 2.