PROBLEM TO BE SOLVED: To provide a vehicle boarding assistance device, a control unit of a vehicle boarding assistance device, and a vehicle boarding assistance method capable of further reducing the troublesomeness when assisting the boarding of a boarding assistance object. SOLUTION: A slope main body 8 which is provided so as to be able to appear and disappear on a body 2 of a vehicle and is bridged between the body 2 and the ground to form a slope 9 and a slope main body 8 so as to appear and disappear. The slope drive source for driving, the seat drive source for driving at least one of the front seats 11R and 11L and the rear seats 12R and 12L installed on the floor 7 of the vehicle, and the slope body 8 so as to project. It is provided with a control unit that drives and controls the slope drive source and drives and controls the seat drive source so as to secure an occupied area Z1 of the wheelchair O1 that moves on the floor 7 while rolling on the slope 9 on the floor 7. [Selection diagram] Fig. 4【課題】乗車補助対象物の乗車を補助する際の煩わしさをより低減できる車両用乗車補助装置、車両用乗車補助装置の制御部及び車両の乗車補助方法を提供する。【解決手段】車両のボデー２に出没可能に設けられ、該ボデー２から突出する状態で地面との間に架け渡されてスロープ９を形成するスロープ本体８と、スロープ本体８が出没するように駆動するスロープ駆動源と、車両のフロア７上に設置された両前部シート１１Ｒ，１１Ｌ及び両後部シート１２Ｒ，１２Ｌの少なくとも一つを駆動するシート駆動源と、スロープ本体８が突出するようにスロープ駆動源を駆動制御するとともに、スロープ９上を転動しつつフロア７上に移動する車椅子Ｏ１の占有領域Ｚ１をフロア７上に確保するべくシート駆動源を駆動制御する制御部とを備える。【選択図】図４
