An installation structure for a vicinity information detection sensor includes the vicinity information detection sensor and a vibration absorbing member. The vicinity information detection sensor includes a detector attached to a vehicle inner side of an outer panel of a vehicle body and configured to radiate electromagnetic waves that function as radar waves that detect vicinity information of a vehicle, and a motor provided in the detector and configured to change a radiation direction of the electromagnetic waves. The vibration absorbing member is placed between the outer panel and the vicinity information detection sensor.