Abstract: A method for producing a light source bulb wherein a shielding film is formed on the outer peripheral face of a glass tube extending along a reference bulb axis, such that a coating for providing the shieiding film can be applied efficiently and precisely onto the outer peripheral face of the glass tube even though the shielding film is complicated in configuration. The method includes horizontally placing a light source bulb, vertically placing a coating discharging portion, moving a front edge face of the coating discharging portion close to the outer peripheral face of the shroud tube, and applying the coating by moving the coating discharging portion and the light source bulb relative to each other along a reference bulb axis and rotating the light source bulb upon the reference bulb axis while the coating is being discharged from the coating discharging portion.

Abstract: A bulb mounting structure for a vehicular lamp having a reflector in which a bulb insertion hole is formed, the structure including a mounting piece for holding a bulb inserted into the bulb insertion hole, the mounting piece comprising a body having a disk-shaped engagement portion engageable with the bulb insertion hole, the disk-shaped engagement portion comprising a concave groove formed in an outer peripheral surface thereof; an elastic seal member received in the concave groove and being depressed against an inner peripheral surface of the bulb insertion hole; wherein a width of the concave groove is larger than a diameter of a cross-section of the elastic seal member.