A vehicular illumination lamp

A projector type lamp unit (20) that includes a movable shade (28) is used for forming an additional light distribution pattern that is added to a low beam distribution pattern when forming a high beam distribution pattern. In such case, the movable shade (28) configured capable of assuming a light shielding position at which light other than light that contributes to forming a center area of the additional light distribution pattern is shielded. In addition, when a pedestrian present ahead of the vehicle is detected based on image data from an on-board camera (52) during vehicle travel using a low beam, a light source (24a) is lit and an actuator (30) drives to move the movable shade (28) to the light shielding position. In this state, a swivel mechanism (40) drives to turn the lamp unit (20) in the horizontal direction to a position at which the center area of the additional light distribution pattern illuminates the pedestrian.