A moving object detection apparatus is configured to calculate, based on detection information of an object from a radar sensor, a moving direction of the object with respect to a host vehicle to generate object information, the object information including information representing the calculated moving direction; set an invalidation time period or an invalidation section; and prevent a calculation of the moving direction during a period from the detection start timing to an invalidation end timing, the invalidation end timing being at a lapse of the invalidation time period or a timing when the object exists from the invalidation section, or prevent the moving direction calculated by the object information generating part from being used in a drive support control during the period from the detection start timing to the invalidation end timing.