A lighting control device for a vehicular lamp which is used as a direction indicator configured to control the on/off of a light source having a plurality of lamp units (2a, 2b, 2c) with at least a first lamp unit and a second unit, each lamp unit (2a, 2b, 2c) having a semiconductor light emitting element, the lighting control device comprising: a control part that is configured to generate and to output a control signal for controlling emitted light of the plurality of lamp units of the light source; and a light source drive part for driving the plurality of lamp units of the light source based on the control signal provided from the control part; wherein lights emitted from the first lamp unit and the second lamp unit which are driven by the light source driving part based on the control signal are such that: before the beginning of a common period, at substantially the same time, a luminous intensity of each of the lights emitted from the first lamp unit and the second lamp unit becomes a first value which is 100% of the luminous intensity and maintains the first value, within the common period, the luminous intensity of each of the lights gradually decreases from the first value to a second value which is 0% of the luminous intensity, and during the entire time within the common period, the luminous intensity of each of the lights decreases to the second value maintaining the relationship that the luminous intensity of the light of the first lamp unit is lower than the luminous intensity of the light of the second lamp unit. a control part that is configured to generate and to output a control signal for controlling emitted light of the plurality of lamp units of the light source; and a light source drive part for driving the plurality of lamp units of the light source based on the control signal provided from the control part; wherein lights emitted from the first lamp unit and the second lamp unit which are driven by the light source driving part based on the control signal are such that: before the beginning of a common period, at substantially the same time, a luminous intensity of each of the lights emitted from the first lamp unit and the second lamp unit becomes a first value which is 100% of the luminous intensity and maintains the first value, within the common period, the luminous intensity of each of the lights gradually decreases from the first value to a second value which is 0% of the luminous intensity, and during the entire time within the common period, the luminous intensity of each of the lights decreases to the second value maintaining the relationship that the luminous intensity of the light of the first lamp unit is lower than the luminous intensity of the light of the second lamp unit. before the beginning of a common period, at substantially the same time, a luminous intensity of each of the lights emitted from the first lamp unit and the second lamp unit becomes a first value which is 100% of the luminous intensity and maintains the first value, within the common period, the luminous intensity of each of the lights gradually decreases from the first value to a second value which is 0% of the luminous intensity, and during the entire time within the common period, the luminous intensity of each of the lights decreases to the second value maintaining the relationship that the luminous intensity of the light of the first lamp unit is lower than the luminous intensity of the light of the second lamp unit.