The assistance system includes a seating surface portion, and a seating surface elevating device that pushes up the buttocks of the assisted person by an upward urging force of the seating surface portion with the buttocks of the assisted person placed on the seating portion, A movable assisting device independent of the seat lifting device, the assisting device includes a support portion, and the support portion is moved by moving the support portion in a state where the upper body of the care receiver is supported by the support portion. The movable assisting device capable of moving the supporter while raising the buttocks of the caregiver, wherein the seating surface portion is provided between the seating surface lifting device and the movable assisting device. When a predetermined condition related to is satisfied, operation becomes possible.介助システムは、座面部を備えており、前記座面部に被介助者の臀部を載置した状態にて前記座面部の上方付勢力により前記被介助者の前記臀部を押し上げる座面昇降装置と、前記座面昇降装置とは独立した移動式介助装置であって、支持部を備えており、前記支持部に前記被介助者の上半身を支持させた状態で前記支持部を移動することにより前記被介助者の前記臀部を上昇させ、前記被介助者を支持した状態で移動可能な前記移動式介助装置と、を備え、前記座面部は、前記座面昇降装置と前記移動式介助装置とに相互に関連する所定条件を満たす場合に、動作可能となる。
