An on-vehicle display control device comprising: a video image data acquiring unit configured to acquire side rear video image data captured by a side camera (12, 13) provided in a movable part (200, 210, 220) that is configured to support the side camera (12, 13) so as to be capable of being folded with respect to a door of a vehicle and configured to capture a rear view of the vehicle and to acquire rear video image data captured by a rear camera provided at a rear of the vehicle and configured to capture the rear view of the vehicle; and a display controller configured to display, on a side monitor (32, 33), the side rear video image data and the rear video image data, characterized in that the display controller is further configured to; when the movable part (200, 210, 220) is in a reference state in which a direction of an optical axis of the side camera (12, 13) is a direction in which a first imaging range predetermined in the side rear video image data captured by the side camera (12, 13) can be entirely captured, clip the first imaging range and display the clipped side rear view image data on the side monitor (32, 33); when the movable part (200, 210, 220) is in a first state which is different from the reference state and in which the direction of the optical axis of the side camera (12, 13) is a direction in which the first imaging range can be entirely captured, clip the first imaging range and display the clipped side rear view image data on the side monitor (32, 33); and when the movable part (200, 210, 220) is in a second state which is different from the reference state and in which the direction of the optical axis of the side camera (12, 13) is a direction in which a part of the first imaging range cannot be captured, generate a combined display image data by combining a first clipped video image which is obtained from the side rear video image data by clipping a first clipping range that is overlapped with a part of the first imaging range and a second clipped video image which is obtained from the rear video image data by clipping a second clipping range that is overlapped with a remaining part as a part which cannot be captured by the side camera (12, 13) in the first imaging range, and display the combined display image data on the side monitor (32, 33), wherein the reference state is a state in which the door of the vehicle is in a fully closed state with respect to the vehicle and the movable part is in a fully opened state with respect to the door of the vehicle. a video image data acquiring unit configured to acquire side rear video image data captured by a side camera (12, 13) provided in a movable part (200, 210, 220) that is configured to support the side camera (12, 13) so as to be capable of being folded with respect to a door of a vehicle and configured to capture a rear view of the vehicle and to acquire rear video image data captured by a rear camera provided at a rear of the vehicle and configured to capture the rear view of the vehicle; and a display controller configured to display, on a side monitor (32, 33), the side rear video image data and the rear video image data, characterized in that the display controller is further configured to; when the movable part (200, 210, 220) is in a reference state in which a direction of an optical axis of the side camera (12, 13) is a direction in which a first imaging range predetermined in the side rear video image data captured by the side camera (12, 13) can be entirely captured, clip the first imaging range and display the clipped side rear view image data on the side monitor (32, 33); when the movable part (200, 210, 220) is in a first state which is different from the reference state and in which the direction of the optical axis of the side camera (12, 13) is a direction in which the first imaging range can be entirely captured, clip the first imaging range and display the clipped side rear view image data on the side monitor (32, 33); and when the movable part (200, 210, 220) is in a second state which is different from the reference state and in which the direction of the optical axis of the side camera (12, 13) is a direction in which a part of the first imaging range cannot be captured, generate a combined display image data by combining a first clipped video image which is obtained from the side rear video image data by clipping a first clipping range that is overlapped with a part of the first imaging range and a second clipped video image which is obtained from the rear video image data by clipping a second clipping range that is overlapped with a remaining part as a part which cannot be captured by the side camera (12, 13) in the first imaging range, and display the combined display image data on the side monitor (32, 33), wherein the reference state is a state in which the door of the vehicle is in a fully closed state with respect to the vehicle and the movable part is in a fully opened state with respect to the door of the vehicle.