PURPOSE: To make it detectable that the replacement timing of equipment has come by counting signals indicating the operating state of the equipment at a detecting section and outputting an alarm signal when the count value reaches the service life value of the equipment.

CONSTITUTION: The equipment service life displaying device is composed of an operation controlling section 2, setting data inputting section 3, set data storing section 4, detecting section 5, and displaying section 6. The detecting section 5 detects signals indicating the operation state of equipment and, when count value reaches the service life value of the equipment, outputs an alarm signal and displays that the replacement timing of the equipment has come based on of the alarm signal. Therefore, the equipment can be replaced at pertinent timing.