A lighting device comprising: a light source module ; a heat sink in which the light source module is disposed and that has a receiver; an inner case disposed in the receiver of the heat sink and having at least one inlet for injecting molding liquid, a circuitry disposed within the inner case, the circuitry supplying electric power to the light source module, and the circuitry including heat generating parts ; a socket which is coupled to the inner case and supplied electric power to the circuitry , characterized in that : the inner case includes: a cylindrical receiver having an opening; a connection portion disposed under the cylindrical receiver and having a diameter less than a diameter of the cylindrical receiver, and an inclined portion connecting the cylindrical receiver with the connection portion, the lighting device comprises a cured molding liquid which is disposed from the opening of the cylindrical receiver to a predetermined height so that the heat generating parts are covered, and the cured molding liquid is not disposed over an entire inside of the inner case , characterised in that the inlet for injecting molding liquid is provided in the inclined portion. a light source module ; a heat sink in which the light source module is disposed and that has a receiver; an inner case disposed in the receiver of the heat sink and having at least one inlet for injecting molding liquid, a circuitry disposed within the inner case, the circuitry supplying electric power to the light source module, and the circuitry including heat generating parts ; a socket which is coupled to the inner case and supplied electric power to the circuitry , characterized in that : the inner case includes: a cylindrical receiver having an opening; a connection portion disposed under the cylindrical receiver and having a diameter less than a diameter of the cylindrical receiver, and an inclined portion connecting the cylindrical receiver with the connection portion, the lighting device comprises a cured molding liquid which is disposed from the opening of the cylindrical receiver to a predetermined height so that the heat generating parts are covered, and the cured molding liquid is not disposed over an entire inside of the inner case , characterised in that the inlet for injecting molding liquid is provided in the inclined portion. the inner case includes: a cylindrical receiver having an opening; a connection portion disposed under the cylindrical receiver and having a diameter less than a diameter of the cylindrical receiver, and an inclined portion connecting the cylindrical receiver with the connection portion, a cylindrical receiver having an opening; a connection portion disposed under the cylindrical receiver and having a diameter less than a diameter of the cylindrical receiver, and an inclined portion connecting the cylindrical receiver with the connection portion, the lighting device comprises a cured molding liquid which is disposed from the opening of the cylindrical receiver to a predetermined height so that the heat generating parts are covered, and the cured molding liquid is not disposed over an entire inside of the inner case , characterised in that the inlet for injecting molding liquid is provided in the inclined portion. <EOS>