The invention relates to a vehicle sliding roof device with a cover unit that is shiftably supported on guides of the sliding roof device by a support device and that can be adjusted between a closed position covering a roof opening and at least one open position, whereby it is provided in accordance with the invention that a locking device which detachably locks the cover unit at least in its closed position and that an arresting device with which the cover unit can be arrested from shifting relative to the guides at least in different opening positions can be activated by a manually operated activation device.