PROBLEM TO BE SOLVED: To provide a nurse call system for allowing another nurse call master unit controlled by a common control machine to perform work hour changeover simultaneously when a work hour changeover operation is performed in an arbitrary nurse call master unit when multiple nurse call master units are controlled by the common control machine.SOLUTION: When a work hour changeover operation is performed from one of multiple nurse call master units 3 controlled by the same control machine 5, the operated nurse call master unit 3 notifies the control machine 5 of the performance of work hour changeover. A control machine CPU 55 transmits a work hour changeover signal to all the nurse call master units 3. Master unit CPUs 38 that have received the work hour changeover signal perform the work hour changeover.
