A three-dimensional camera comprising: a light transmitting unit configured to generate infrared (IR) light with a predetermined pattern added thereto and transmit the same; a light receiving unit configured to sense RGB light and reflected light of the transmitted IR light; and a control unit configured to control the light transmitting unit and the light receiving unit , and generate a 3D image by using the sensed RGB light and the reflected light of the sensed IR light, wherein the light receiving unit comprises: a lens configured to collect the RGB light and the reflected light of the IR light; a reflective mirror and an X-prism positioned between the lens and the reflective mirror , the reflective mirror being configured to reflect light collected by the lens via the X-prism to a first path and a second path and the X-prism being configured to pass the light collected by the lens and the light reflected from the reflective mirror through the X-prism and to the first path and the second path, wherein the first path and the second path are separated and formed to be parallel with a reflective surface of the reflective mirror ; an RGB sensor configured to sense the RGB light from light reflected via the X-prism to the first path; and an IR sensor configured to sense the reflected light of the IR light from light reflected via the X-prism to the second path. a light transmitting unit configured to generate infrared (IR) light with a predetermined pattern added thereto and transmit the same; a light receiving unit configured to sense RGB light and reflected light of the transmitted IR light; and a control unit configured to control the light transmitting unit and the light receiving unit , and generate a 3D image by using the sensed RGB light and the reflected light of the sensed IR light, wherein the light receiving unit comprises: a lens configured to collect the RGB light and the reflected light of the IR light; a reflective mirror and an X-prism positioned between the lens and the reflective mirror , the reflective mirror being configured to reflect light collected by the lens via the X-prism to a first path and a second path and the X-prism being configured to pass the light collected by the lens and the light reflected from the reflective mirror through the X-prism and to the first path and the second path, wherein the first path and the second path are separated and formed to be parallel with a reflective surface of the reflective mirror ; an RGB sensor configured to sense the RGB light from light reflected via the X-prism to the first path; and an IR sensor configured to sense the reflected light of the IR light from light reflected via the X-prism to the second path. a lens configured to collect the RGB light and the reflected light of the IR light; a reflective mirror and an X-prism positioned between the lens and the reflective mirror , the reflective mirror being configured to reflect light collected by the lens via the X-prism to a first path and a second path and the X-prism being configured to pass the light collected by the lens and the light reflected from the reflective mirror through the X-prism and to the first path and the second path, wherein the first path and the second path are separated and formed to be parallel with a reflective surface of the reflective mirror ; an RGB sensor configured to sense the RGB light from light reflected via the X-prism to the first path; and an IR sensor configured to sense the reflected light of the IR light from light reflected via the X-prism to the second path. <EOS>