To provide an inexpensive identification code lock for an opening-closing door, for easily changing an identification code, by positioning the identification code lock by manual operation from both indoor and outdoor surfaces.

This rotary plate type identification code lock 30 comprises a casing 31, a plurality of coded rotary plates 35 arranged in the casing 31, rotating around the axis of the casing 31 and inscribing a code on an outer peripheral surface, and a bar-shaped locking member 34 penetrating through the rotary plates 35 when positioning the rotary plates 35 as the identification code and movable in the substantially right-angled direction to the rotary plates 35. The movement of the locking member 34 is checked by the rotary plates 35 without being positioned in a position corresponding to the identification code among the plurality of rotary plates 35, and the locking member 34 is movably constituted in the shaft direction when positioning all the rotary plates 35 as the identification code. The identification code is easily changed, and a word can also be used as the identification code.