Target point arrival detector and vehicle-mounted device control system

The present invention relates to a target point arrival detector, method of detecting target point arrival and vehicle-mounted device control system, with which accidents at a point where a surface is inclined and has a poor vision can be prevented. The target point arrival detector for detecting that a vehicle arrives at a target point based on an image ahead of the vehicle moving on a surface captured by two image capturing units (110A, 110B) includes a target point arrival signal output unit (143), using a processing circuit, to output a signal indicating that the vehicle arrives at the target point where an inclination condition of a surface ahead of the vehicle with respect to a surface over which the vehicle moves changes to a downward based on the captured image.