A vehicle lamp control apparatus comprising: a receiver configured to receive an acceleration from which a tilt angle (θ) of a vehicle with respect to a horizontal plane is derivable, the acceleration being detected by an acceleration sensor; and a controller configured to control adjustment of an optical axis of a vehicle lamp, characterized in that a sum angle (θ) includes a first angle (θ r) and a second angle (θ v), wherein the sum angle (θ) is the tilt angle (θ) of the vehicle with respect to the horizontal plane, wherein the first angle (θ r) is a tilt angle of a road surface with respect to the horizontal plane, wherein the second angle (θ v) is a tilt angle of the vehicle with respect to the road surface, wherein the controller is configured to store the reference value of the first angle (θ r) and a reference value of the second angle (θ v), wherein the controller is configured to update the reference value of the second angle (θ v) by treating change of the sum angle (θ) during vehicle stop as change of the second angle (θ v), wherein the controller is configured to output during vehicle stop a control signal instructing adjustment of the optical axis according to the updated reference value of the second angle (θ v), wherein the controller is configured to update the reference value of the first angle (θ r) by treating, as change of the first angle (θ r), change of the sum angle (θ) when the vehicle is stopped, and wherein the controller is configured to derive a difference between a value of the sum angle (θ) and a sum of the reference value of the first angle (θ r) and the reference value of the second angle (θ v), and the controller is configured to correct at least one of the reference value of the first angle (θ r) and the reference value of the second angle (θ v) so as to reduce the difference. a receiver configured to receive an acceleration from which a tilt angle (θ) of a vehicle with respect to a horizontal plane is derivable, the acceleration being detected by an acceleration sensor; and a controller configured to control adjustment of an optical axis of a vehicle lamp, characterized in that a sum angle (θ) includes a first angle (θ r) and a second angle (θ v), wherein the sum angle (θ) is the tilt angle (θ) of the vehicle with respect to the horizontal plane, wherein the first angle (θ r) is a tilt angle of a road surface with respect to the horizontal plane, wherein the second angle (θ v) is a tilt angle of the vehicle with respect to the road surface, wherein the controller is configured to store the reference value of the first angle (θ r) and a reference value of the second angle (θ v), wherein the controller is configured to update the reference value of the second angle (θ v) by treating change of the sum angle (θ) during vehicle stop as change of the second angle (θ v), wherein the controller is configured to output during vehicle stop a control signal instructing adjustment of the optical axis according to the updated reference value of the second angle (θ v), wherein the controller is configured to update the reference value of the first angle (θ r) by treating, as change of the first angle (θ r), change of the sum angle (θ) when the vehicle is stopped, and wherein the controller is configured to derive a difference between a value of the sum angle (θ) and a sum of the reference value of the first angle (θ r) and the reference value of the second angle (θ v), and the controller is configured to correct at least one of the reference value of the first angle (θ r) and the reference value of the second angle (θ v) so as to reduce the difference.