Abstract: A protruding outer wall 702 is provided that surrounds cord insertion holes 704 (704a, 704b) used for inserting power supply cords 6 (6a, 6b) that supply current to light source bulbs 1 (1a, 1b). An inside region 705 of the outer wall 702 is filled with a soft synthetic resin 9 which is then cured. Further, inner walls 703 (703a, 703b) are provided in an interior region 705 so as to ensure air tightness and waterproof performance of the cord insertion holes 704 (704a, 704b). The structure ensures air tightness and waterproof performance of a back cover for a lamp body while reducing the number of man hours required to fix a power supply cord to the back cover.

Abstract: A protruding outer wall 702 is provided that surrounds cord insertion holes 704 (704a, 704b) used for inserting power supply cords 6 (6a, 6b) that supply current to light source bulbs 1 (1a, 1b). An inside region 705 of the outer wall 702 is filled with a soft synthetic resin 9 which is then cured. Further, inner walls 703 (703a, 703b) are provided in an interior region 705 so as to ensure air tightness and waterproof performance of the cord insertion holes 704 (704a, 704b). The structure ensures air tightness and waterproof performance of a back cover for a lamp body while reducing the number of man hours required to fix a power supply cord to the back cover.