A drop-off assist device comprising: a radio wave sensor configured to detect an object; and a processor configured to detect an object that is approaching a host vehicle based on the results of detection by the radio wave sensor, acquire a predicted movement path of the object based on the results of the detection by the radio wave sensor when the object is detected, set the object as a target approaching object when the predicted movement path acquired by the processor is a path that passes by a door of the host vehicle, and issue an alarm when it is determined that there is a possibility that the target approaching object passes by the door of the host vehicle, and the drop-off assist device being characterized in that the processor is also configured to: determine that there is a possibility that the target approaching object passes by the door of the host vehicle when a second object that is different from the target approaching object is not present between the target approaching object and the host vehicle, correct the predicted movement path based on a position of an edge of the second object when the second object is present between the target approaching object and the host vehicle at the time of setting the target approaching object, determine that there is the possibility that the target approaching object passes by the door of the host vehicle when the predicted movement path corrected by the processor is a path that passes by the door of the host vehicle. a radio wave sensor configured to detect an object; and a processor configured to detect an object that is approaching a host vehicle based on the results of detection by the radio wave sensor, acquire a predicted movement path of the object based on the results of the detection by the radio wave sensor when the object is detected, set the object as a target approaching object when the predicted movement path acquired by the processor is a path that passes by a door of the host vehicle, and issue an alarm when it is determined that there is a possibility that the target approaching object passes by the door of the host vehicle, and the drop-off assist device being characterized in that the processor is also configured to: determine that there is a possibility that the target approaching object passes by the door of the host vehicle when a second object that is different from the target approaching object is not present between the target approaching object and the host vehicle, correct the predicted movement path based on a position of an edge of the second object when the second object is present between the target approaching object and the host vehicle at the time of setting the target approaching object, determine that there is the possibility that the target approaching object passes by the door of the host vehicle when the predicted movement path corrected by the processor is a path that passes by the door of the host vehicle. detect an object that is approaching a host vehicle based on the results of detection by the radio wave sensor, acquire a predicted movement path of the object based on the results of the detection by the radio wave sensor when the object is detected, set the object as a target approaching object when the predicted movement path acquired by the processor is a path that passes by a door of the host vehicle, and issue an alarm when it is determined that there is a possibility that the target approaching object passes by the door of the host vehicle, and determine that there is a possibility that the target approaching object passes by the door of the host vehicle when a second object that is different from the target approaching object is not present between the target approaching object and the host vehicle, correct the predicted movement path based on a position of an edge of the second object when the second object is present between the target approaching object and the host vehicle at the time of setting the target approaching object, determine that there is the possibility that the target approaching object passes by the door of the host vehicle when the predicted movement path corrected by the processor is a path that passes by the door of the host vehicle.