A vehicle sensor attaching structure in which a plurality of kinds of external sensors for detecting an external condition of a vehicle is attached on a roof of the vehicle, the vehicle sensor attaching structure including: a common sensor unit that is fixed to the roof of the vehicle and to which at least one kind of the external sensor is attached; and an option sensor unit that is attachable to the common sensor unit in at least two directions of a vehicle left side, a vehicle right side, a vehicle upper side, a vehicle front side, and a vehicle rear side, that is detachably attached to the common sensor unit, and to which at least one kind of the external sensor is attached.