Vehicular headlamp system and control device

A vehicular headlamp system is provided which includes: a first optical system (10La) capable of forming in a radiation region thereof a dark portion (41a) extending linearly to a front of a lamp; a second optical system (10Lb) provided at a different position in a lateral direction from the first optical system (10La) and capable of radiating light to the front of the lamp; a front sensor (20) that detects a light shield object A to be shielded from light such as an oncoming vehicle; and a control unit (30) that controls the first optical system (10La) and the second optical system (10Lb) based on a position of the light shield object A so that the first optical system (10La) forms the dark portion on the light shield object A and that the second optical system (10Lb) irradiates regions located on front and rear sides of the light shield object A in the dark portion (41a) with light.