An automotive lamp (10) which reduces dazzle to the drivers of other vehicles by adjusting a light pattern (P1, P2) of irradiated light and a method of adjusting the automotive lamp (10) is provided. An automotive lamp (10) includes a light irradiation device (100) which forms first and second patterns (P1, P2) at least partially overlapping each other by irradiating light and a control device (200) configured to adjust light irradiation device (100) to form a shadow area (S) at a position of a second vehicle (2-4) when the second vehicle (2-4) exists in an area of a beam pattern (P) in which the first and second patterns (P1, P2) are synthesized with each other. The control device (200) is configured to determine a size of the shadow area (S) by referring to whether the second vehicle (2-4) exists in a non-uniform overlap section, in which the first pattern (P1) and the second pattern (P2) overlap each other to a non-uniform degree in an irradiation section of the light.