To solve such the problem that, while a calling grip button for a nurse call is installed near a patient, since the place to install it is different for each patient, the position of the button cannot be fixed and it sometimes falls down from a bed.

A cable for connecting the call grip button for a nurse call and a nurse call slave unit includes a biometal fiber having a property to be hard like a piano wire when a current is made to flow as a center line inside the cable. By energizing the biometal fiber after installation is completed, the position of the call grip button for a nurse call is fixed.