An object detection apparatus comprising: a first measurement unit configured to measure first positional information regarding a first object existing in a first scan range on the basis of a first reflected wave of a first wave radiated onto the first scan range including at least a first region; a second measurement unit configured to measure second positional information regarding a second object existing in a second scan range on the basis of a second reflected wave of a second wave radiated onto the second scan range including the first region and a second region, the second region being located outside the first scan range; and a detection unit configured to detect a third object existing in the first region on the basis of the first positional information obtained from the first measurement unit and the second positional information obtained from the second measurement unit, characterized in that: when a first coordinate position relating to the first positional information and a second coordinate position relating to the second positional information are included in the first region, a determination unit is configured to determine whether or not the first coordinate position and the second coordinate position match, and when the first coordinate position and the second coordinate position match, the detection unit is configured to determine that the third object is an actually existing object in the first region and, when the first coordinate position and the second coordinate position do not match, the detection unit is configured to determine that the third object is an erroneously detected object in the first region. a first measurement unit configured to measure first positional information regarding a first object existing in a first scan range on the basis of a first reflected wave of a first wave radiated onto the first scan range including at least a first region; a second measurement unit configured to measure second positional information regarding a second object existing in a second scan range on the basis of a second reflected wave of a second wave radiated onto the second scan range including the first region and a second region, the second region being located outside the first scan range; and a detection unit configured to detect a third object existing in the first region on the basis of the first positional information obtained from the first measurement unit and the second positional information obtained from the second measurement unit, characterized in that: when a first coordinate position relating to the first positional information and a second coordinate position relating to the second positional information are included in the first region, a determination unit is configured to determine whether or not the first coordinate position and the second coordinate position match, and when the first coordinate position and the second coordinate position match, the detection unit is configured to determine that the third object is an actually existing object in the first region and, when the first coordinate position and the second coordinate position do not match, the detection unit is configured to determine that the third object is an erroneously detected object in the first region. when a first coordinate position relating to the first positional information and a second coordinate position relating to the second positional information are included in the first region, a determination unit is configured to determine whether or not the first coordinate position and the second coordinate position match, and when the first coordinate position and the second coordinate position match, the detection unit is configured to determine that the third object is an actually existing object in the first region and, when the first coordinate position and the second coordinate position do not match, the detection unit is configured to determine that the third object is an erroneously detected object in the first region.