In a vehicle air-conditioner-unit attachment-part structure, an air conditioner unit is arranged to face a rear surface of a dashboard and on an occupant room side. An air conditioner unit-side fixation part that is provided on a unit case is attached to a vehicle body-side fixed part at a more vehicle rearward position than the dashboard. A displacement acceptance part that accepts a movement to a vehicle rearward direction of the unit case with respect to the vehicle body-side fixed part is provided between the air conditioner unit-side fixation part and the vehicle body-side fixed part when an impact load is input to the unit case via the dashboard from a vehicle frontward direction.