An illumination device for a vehicle configured to illuminate an armrest on a door trim of the vehicle includes a light source and a light directing member. The light source is arranged above the armrest and has a light emitting portion configured to emit light toward the armrest. The light directing member is arranged so as to cover the light emitting portion from below. The light directing member is configured to direct the light emitted from the light emitting portion toward the armrest toward a front of the vehicle.