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.