The present invention aims to perform optical axis adjustment while a vehicle is stopped only in necessary situations and to avoid unnecessary adjustment, and to further enhance durability. A headlight optical axis adjustment device (10) for adjusting an optical axis of a headlight based on a pitch angle of the vehicle includes an opened/closed state detection section (22) for detecting an open/closed state of an open/close unit where the opened state is when a passenger gets on/out or when a baggage is being loaded/unloaded to and from the vehicle; and an optical axis adjustment permitting section (26) for permitting optical axis adjustment of the headlight based on the pitch angle of the vehicle when the opened state of the open/close unit is detected by the opened/closed state detection section.
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