The present invention relates to a camera module mounted with an external look-forming holder improved in heat emission function, the camera module including: a housing; a lens insertion hole opened toward an upper surface of the housing for insertion of a lens; a filter attachment unit formed on a floor surface of the housing for attaching a filter; and a heat emission outlet formed on an upper surface of the lens insertion hole in an upper-wide/bottom-narrow shape, wherein a heat emission outlet is formed at an upper surface of a lens insertion hole to induce heat generated from inside of a housing to be emitted to outside along an inner side of the heat emission outlet.