A light source module comprising: at least one light source emitting light; and a body supporting the light source, wherein the body comprises: a heat sink absorbing heat from the light source and dissipating the heat to the outside; an insulating layer having electrical insulating properties, the insulating layer being provided on at least one surface of the heat sink; and an electrically and thermally conductive layer provided on the insulating layer to provide an electrical and thermal flow path to/from the light source, wherein the electrically and thermally conductive layer comprises: an electrically conductive layer providing a path region in which electric current is supplied to the light source, and a heat dissipation conductive layer for diffusing heat generated by the light source and not providing a path region in which electric current is supplied to the light source, wherein the electrically and thermally conductive layer is provided on a metal junction face characterized in that: the metal junction face is processed on the insulating layer, the metal junction face has a metal core generated by decomposing a core generating agent contained in the insulating layer, and the metal core is joined to a metal providing the electrically and thermally conductive layer. at least one light source emitting light; and a body supporting the light source, wherein the body comprises: a heat sink absorbing heat from the light source and dissipating the heat to the outside; an insulating layer having electrical insulating properties, the insulating layer being provided on at least one surface of the heat sink; and an electrically and thermally conductive layer provided on the insulating layer to provide an electrical and thermal flow path to/from the light source, wherein the electrically and thermally conductive layer comprises: an electrically conductive layer providing a path region in which electric current is supplied to the light source, and a heat dissipation conductive layer for diffusing heat generated by the light source and not providing a path region in which electric current is supplied to the light source, wherein the electrically and thermally conductive layer is provided on a metal junction face characterized in that: the metal junction face is processed on the insulating layer, the metal junction face has a metal core generated by decomposing a core generating agent contained in the insulating layer, and the metal core is joined to a metal providing the electrically and thermally conductive layer. a heat sink absorbing heat from the light source and dissipating the heat to the outside; an insulating layer having electrical insulating properties, the insulating layer being provided on at least one surface of the heat sink; and an electrically and thermally conductive layer provided on the insulating layer to provide an electrical and thermal flow path to/from the light source, wherein the electrically and thermally conductive layer comprises: an electrically conductive layer providing a path region in which electric current is supplied to the light source, and a heat dissipation conductive layer for diffusing heat generated by the light source and not providing a path region in which electric current is supplied to the light source, wherein the electrically and thermally conductive layer is provided on a metal junction face an electrically conductive layer providing a path region in which electric current is supplied to the light source, and a heat dissipation conductive layer for diffusing heat generated by the light source and not providing a path region in which electric current is supplied to the light source, wherein the electrically and thermally conductive layer is provided on a metal junction face characterized in that: the metal junction face is processed on the insulating layer, the metal junction face has a metal core generated by decomposing a core generating agent contained in the insulating layer, and the metal core is joined to a metal providing the electrically and thermally conductive layer. the metal junction face is processed on the insulating layer, the metal junction face has a metal core generated by decomposing a core generating agent contained in the insulating layer, and the metal core is joined to a metal providing the electrically and thermally conductive layer.