To provide a vehicular electric bulb capable of simply assembling and certainly fixing a pressing spring of a simple shape, with good workability.

A vehicular electric bulb 1 detachably attached to a reflector of a vehicular lighting fixture, integrates a metallic cap 8 fixed to an end portion of a glass bulb 2 including a filament 3, and a metallic sleeve 9 integrated with a mouthpiece resin portion 10 by joining a plurality of projections 8a-8d, and 9a-9d formed on the outer peripheries of those. The vehicular electric bulb 1 stores a pressing spring 13 in the metallic sleeve 9, and projects out a part of the pressing spring 13 to the outside from a through-hole formed on a part of the outer periphery of the metallic sleeve 9. The pressing spring 13 is configured by a polygon frame body. One vertex is projected out to the outside through a notch 12 of the metallic sleeve 12, and a plurality of the other vertices are engaged with an inner periphery of the metallic sleeve 9.