An in-wheel motor driving device for a movement device, comprising: a wheel including an in-wheel; an in-wheel motor provided inside the in-wheel and rotating the in-wheel; a supporting portion connecting the in-wheel motor and the movement device; and a buffer provided between the in-wheel motor and the movement device so as to buffer an impact generated during vertical movement, the supporting portion comprises: a guide bar that is installed on any one of a side of the in-wheel motor or the movement device and is extended in a certain length in a vertical direction, wherein upper and lower ends of the guide bar are fixed to the one of a side of the in-wheel motor or the movement device, and a guide block that is provided to the other of the side of the in-wheel motor or the movement device, coupled to be to the guide bar and slidingly movable in a vertical direction, and wherein a pair of guide bars is provided in parallel, and any one of upper portions or lower portions of the pair of guide bars include a first extension member that is horizontally extended, the first extension member supports a first end of the buffer, characterized in that the other of upper portion and lower portion of the guide block includes a second extension member that is horizontally extended, the second extension member supports a second end of the buffer. a wheel including an in-wheel; an in-wheel motor provided inside the in-wheel and rotating the in-wheel; a supporting portion connecting the in-wheel motor and the movement device; and a buffer provided between the in-wheel motor and the movement device so as to buffer an impact generated during vertical movement, the supporting portion comprises: a guide bar that is installed on any one of a side of the in-wheel motor or the movement device and is extended in a certain length in a vertical direction, wherein upper and lower ends of the guide bar are fixed to the one of a side of the in-wheel motor or the movement device, and a guide block that is provided to the other of the side of the in-wheel motor or the movement device, coupled to be to the guide bar and slidingly movable in a vertical direction, and wherein a pair of guide bars is provided in parallel, and any one of upper portions or lower portions of the pair of guide bars include a first extension member that is horizontally extended, the first extension member supports a first end of the buffer, characterized in that the other of upper portion and lower portion of the guide block includes a second extension member that is horizontally extended, the second extension member supports a second end of the buffer. a guide bar that is installed on any one of a side of the in-wheel motor or the movement device and is extended in a certain length in a vertical direction, wherein upper and lower ends of the guide bar are fixed to the one of a side of the in-wheel motor or the movement device, and a guide block that is provided to the other of the side of the in-wheel motor or the movement device, coupled to be to the guide bar and slidingly movable in a vertical direction, and wherein a pair of guide bars is provided in parallel, and any one of upper portions or lower portions of the pair of guide bars include a first extension member that is horizontally extended, the first extension member supports a first end of the buffer, characterized in that the other of upper portion and lower portion of the guide block includes a second extension member that is horizontally extended, the second extension member supports a second end of the buffer.