A camera device without an image displaying function which is adapted to assemble with a portable electronic device with a vision displaying module is disclosed in the present invention. The camera device is electrically connected to the portable electronic device via wire/wireless connection. The camera device includes a base, a lens module and at least one touch navigation module. The base includes a surrounding component whereinside the lens module is disposed. The lens module includes a lens assembly and a digital processing unit. The touch navigation module is disposed on an outer surface of the surrounding component and electrically connected to the lens module. The touch navigation module detects an input command to trigger the lens assembly to capture an image, or controls parameters of an adjustable mode of the lens assembly via the digital processing unit.