An elevator apparatus, comprising: a car provided in a hoistway; an elevator door for opening and closing an elevator doorway; a driving device for applying a driving force to the car; a brake device for braking raising and lowering of the car; door opening/closing detection means for generating a signal corresponding to an open/closed state of the elevator door; car-position detection means for generating a signal corresponding to a position of the car; power-feed switching means (11, 27) for performing switching between power-feeding and interruption of the power-feeding to a target of interruption of power feeding, which is at least any one of the driving device and the brake device; an operation control section for controlling an operation of the car and generating a switching drive signal to transmit the switching drive signal to the power-feed switching means (11, 27) to control a switching operation of the power-feed switching means (11, 27); and a door-open running preventing protection section for monitoring the position of the car and the open/closed state of the elevator door via the door opening/closing detection means and the car-position detection means so as to be capable of detecting door-open running of the car, and for generating a door-open running preventing protection signal (51A, 52C) to transmit the door-open running preventing protection signal to the power-feed switching means (11, 27) so as to interrupt the power feeding to the target of interruption of power feeding when the door-open running of the car is detected, wherein: the door-open running preventing protection section is capable of generating a switching drive command for controlling the switching operation of the power-feed switching means (11, 27); and the operation control section determines the switching operation of the power-feed switching means based on a determination made by itself and generates the switching drive signal corresponding to the determination when the car operates in a normal operation mode, and characterised in that the operation control section determines the switching operation of the power-feed switching means (11, 27) in response to the switching drive command from the door-open running preventing protection section and generates the switching drive signal corresponding to the determination when the operation control section operates in a diagnosis mode in which the car is stopped. a car provided in a hoistway; an elevator door for opening and closing an elevator doorway; a driving device for applying a driving force to the car; a brake device for braking raising and lowering of the car; door opening/closing detection means for generating a signal corresponding to an open/closed state of the elevator door; car-position detection means for generating a signal corresponding to a position of the car; power-feed switching means (11, 27) for performing switching between power-feeding and interruption of the power-feeding to a target of interruption of power feeding, which is at least any one of the driving device and the brake device; an operation control section for controlling an operation of the car and generating a switching drive signal to transmit the switching drive signal to the power-feed switching means (11, 27) to control a switching operation of the power-feed switching means (11, 27); and a door-open running preventing protection section for monitoring the position of the car and the open/closed state of the elevator door via the door opening/closing detection means and the car-position detection means so as to be capable of detecting door-open running of the car, and for generating a door-open running preventing protection signal (51A, 52C) to transmit the door-open running preventing protection signal to the power-feed switching means (11, 27) so as to interrupt the power feeding to the target of interruption of power feeding when the door-open running of the car is detected, wherein: the door-open running preventing protection section is capable of generating a switching drive command for controlling the switching operation of the power-feed switching means (11, 27); and the operation control section determines the switching operation of the power-feed switching means based on a determination made by itself and generates the switching drive signal corresponding to the determination when the car operates in a normal operation mode, and the door-open running preventing protection section is capable of generating a switching drive command for controlling the switching operation of the power-feed switching means (11, 27); and the operation control section determines the switching operation of the power-feed switching means based on a determination made by itself and generates the switching drive signal corresponding to the determination when the car operates in a normal operation mode, and characterised in that the operation control section determines the switching operation of the power-feed switching means (11, 27) in response to the switching drive command from the door-open running preventing protection section and generates the switching drive signal corresponding to the determination when the operation control section operates in a diagnosis mode in which the car is stopped.