To provide a wedge base bulb for vehicle ensuring a sufficient amount of light when unlighting and emitting light for a long time, without causing such a problem that a light-accumulating light-emitting part drops or is damaged by vibration or impact while a vehicle is running.

Two lead wires 4 introduced into a glass tube 2 while penetrating a base 2a formed at an end of the glass tube 2 integrally therewith are held by passing the lead wires through a common bridge glass 5, and a filament 6 is stretched between the tips of both lead wires 4. In such a wedge base bulb 1 for vehicle, the bridge glass 5 is coated with a light-accumulating paint. Furthermore, a slit-like groove is formed in the surface of the bridge glass 5.