LIGHT DISTRIBUTION CONTROL DEVICE, LIGHT DISTRIBUTION CONTROL METHOD, AND STORAGE MEDIUM

A light distribution control device including: an acquirer acquiring information representing a running status of an assistance operation performed for driving assistance from a driving assistance device performing driving assistance of a subject vehicle based on a recognition result of objects disposed in front of the subject vehicle recognized based on detection results acquired by a plurality of sensors including an optical sensor; and a light distribution controller performing light distribution control including change of an output level of a headlight of the subject vehicle, in which the light distribution controller gently performs change of the output level of the headlight in accordance with running of the assistance operation in the light distribution control.