Patent ID: 6976776

Claim:
A bulb insertion structure of a vehicular lamp comprising: a plurality of fixing protrusions formed on an outer periphery of a rear end portion of a cylindrical socket fixture fixed in a bulb insertion hole of a reflector; a plurality of engaging protrusions formed on an outer periphery of a focus ring provided on a bulb and corresponding to the fixing protrusions; and a cup-shaped socket covering the outer periphery of the socket fixture from the rear, the cup-shaped socket incorporating a spring for pressing forward the rear end portion of the accommodated bulb, and having an outer peripheral wall provided with, at multiple locations corresponding to the fixing protrusions, an engaging notch for holding the engaging protrusion and the fixing protrusion overlapped together, wherein the engaging notch is provided with an engaging recess portion for holding the engaging protrusion in the engaging notch when the cup-shaped socket is pulled out from the socket fixture, characterized in that a slit, which extends continuously from the engaging recess portion of the engaging notch in a circumferential direction, is formed of a size that allows the engaging protrusion and the fixing protrusion only to pass therethrough separately.