DOOR OPENING/CLOSING DETERMINATION DEVICE AND DOOROPENING/CLOSING DETERMINATION METHOD

A vehicle doorway camera includes vehicle doors and a vicinity of the doors in a cabin within an imaging range. A vehicle interior monitoring ECU is provided with a gravity center calculating section and a determining section. The gravity center calculating section calculates an occupant's gravity center position included in a captured image. The determining section determines whether or not the gravity center position is included in a keep out area provided in the vicinity of the doors. A loudspeaker issues an alarm inside the cabin when it is determined by the determining section that the gravity center position is included in the keep out area.