The method for transmitting an image component for a 3D image according to one embodiment of the present invention comprises: a step of generating one or more texture image components and one or more depth map image components; a step of generating an SEI (supplemental enhancement information) message including a 3D layer information element for signaling layer information relating to coding between said one or more texture image components and one or more depth map image components; a step of generating an NAL unit including the SEI message including said 3D layer information element; and a step of generating a broadcast signal including said one or more texture image components, said one or more depth map image components and the NAL unit.