Lighting device and method manufacturing holder of lighting device

A lighting device, comprising:

• a module comprising a substrate and a light source that comprises at least one light-emitting diode element and that is mounted on the substrate;
• and
• a holder comprising a heat conductor that is thermally connected to the at least one light-emitting diode element of the light source and comprising an insulation layer,
• the heat conductor comprising an annular stepped portion provided on an upper portion of the holder, an annular flange that extends upward from an annular outer peripheral edge of the stepped portion and a cylindrical portion that extends from an annular inner peripheral edge of the stepped portion downward under the substrate,
• the insulation layer covering at least outer peripheral surfaces of the annular stepped portion, the annular flange and the cylindrical portion,
• the substrate on that the light source of the module is mounted being supported on the annular stepped portion of the heat conductor.

A method manufacturing a holder of a lighting device, comprising:

• disposing a heat conductor comprising a stepped portion and a flange that extends upward from an peripheral edge of the stepped portion in a die;
• injecting a resin between an inner surface of the die and an outer peripheral surface of the heat conductor to form an insulation layer integrated on the outer peripheral surface of the heat conductor;
• and
• pressing the stepped portion of the heat conductor against the die by an injection pressure when injecting the resin between the inner surface of the die and the outer peripheral surface of the heat conductor.