PURPOSE: To diversify function by performing routine operations from the outside surface while performing routine operations, arbitrary convenient operation and automatic emergency unlocking from the inside face.

CONSTITUTION: A conventional lock is provided to a door section (b) and, at the same time, a hook (d) of the lock is provided to an outer frame (a) to interlock with free operation or an emergency equipment. While, an equipment (e) is provided to interlock with an emergency equipment by utilizing magnetism and, at the same time, the mechanism (f) to lock or unlock based on routine or free operation is provided. In addition, an insertion part (g) of writing goods, etc. is provided to move the hook (d) of the lock provided to the outer frame (a) freely in the direction of the right and left. In that way, locking or unlocking can be made from the outside surface and, at the same time, unlocking can be also made from the inside surface. According to the constitution, the mechanism capable of functioning well with self-control of the number of persons to be admitted and opposition in the case of emergency can be obtained.