Abstract: The present invention relates to a safety ensuring apparatus for ensuring the safety of an operator.A mechanical moving part is surrounded by a safety enclosure with a door of the safety enclosure provided with a door lock device constructed such that the door lock device releases a door lock when a current is supplied from outside to excite a solenoid incorporated therein. The apparatus is constructed such that a lock is released when the mechanical moving part is stopped. Moreover, the construction incorporates a moving part monitoring sensor which monitors if the mechanical moving part is stopped. When mechanical moving part is stopped, the moving part monitoring sensor generates, without a negative operation, an output signal of logic value 1 corresponding to a high energy condition, and the solenoid of the door lock device is excited by this output signal.As a result, the lock of the door lock device is released once the mechanical moving part has stopped.