A support device for a vehicle child
seat belt tightens the shoulders and the abdominal area of a child using the existing vehicle
seat belt as it is in a state where the
vest type support device is easily worn on the body of the child, and which includes a
cushion body for fastening the entire front face of the body of the child and an auxiliary belt for preventing the child from upwardly or downwardly escaping from the
seat belt. The vehicle child seat belt support device includes: a shock-preventing
cushion body formed to surround a child's body and having a seat belt receiving part formed on a front face thereof in such a fashion that the seat belt is detachably accommodated in the seat belt receiving part; and a separation-preventing auxiliary belt for supporting the back of the child so as to prevent the shock-preventing
cushion body from being separated from the child's body, the separation-preventing auxiliary belt having an end joined to one side of an upper portion of the cushion body and the other end joined to one side of a lower portion of the cushion body.