Abstract: A vehicular turn signal lamp in which part of the direct light from the light bulb is reflected from the reflector of an inner cap and applied through the rear lens portion of an outer lens. Hence, an observer at the rear of (or in front of) the vehicle body can observe the lamp more positively, and the lamp gives a positive signal to the observer that the vehicle will turn. The turn signal lamp includes a lamp body having a reflecting mirror surface formed on at least a portion of an inner surface thereof, a light bulb mounted in a rear opening in the lamp body, an inner cap covering the light bulb, a reflector protruding from an outer surface of the inner cap for reflecting light from the light bulb rearwardly, and an outer lens engaged with a front opening of the lamp body and having a rear lens portion through which light reflected from the reflector passes. The rear lens portion extends beyond a side panel of the vehicle when the lamp is installed on the vehicle.