PURPOSE: To easily change unlocking specification by obtaining temporary locking state by a latch bolt provided in such a manner as to be capable of sliding, and rotating an interior operating member to the axial outside as occasion demands.

CONSTITUTION: An inside handle 4 and an outside handle 5 are supported to an inside washer 2 and an outside washer 2 mounted with a door 1 between in such a manner as to be capable of sliding. Protruding beams 9, 10 are provided on the inside handle 4 and the outside handle 5, and their inner end parts are introduced into a latch case 11, and repelling force is regularly given thereto so that they engagingly contact with the rear end part 13a of a latch bolt 13. An inside hub 14 and an outside hub 15 are connected to each other by a locking bar 16 passed through the latch case 11. By pressing an operating member 17, the inside hub 14 is rotatably mounted. Further, the locking bar 16 is passed through the central angle hole 21a of a driven hub 21.