An elevator monitoring device enables positional relationship of elevator cars to be grasped. The knee immobilizer includes an elongate splint with a substrate impregnated or coated with a reactive system. The lossy transmission line includes resistive material placed along the opposing longitudinal edges thereof. The arrangement of the vibration control rubbers on side surfaces of the engine is such that angle \u03b1 of longitudinal axes of the vibration control rubbers with respect to the advancing direction of the vehicle becomes gradually larger moving from the front to the rear of the engine.