An autonomous transport vehicle comprising: a vehicle body, that includes a traveling wheel, is configured to enter a lower side of a transported object, and is configured to travel while towing the transported object; and a weight acting portion configured to cause, in a case where a total weight of the transported object is larger than a predetermined weight, a partial weight of the total weight equal to or less than the predetermined weight to act on the vehicle body from the transported object, wherein the weight acting portion includes an elastic support portion that is provided on the vehicle body so as to be capable of being lifted and lowered, and is configured to support the transported object from the lower side via an elastic body, wherein the elastic support portion includes a base body that is provided on the vehicle body so as to be capable of being lifted and lowered, a support body that is provided on the base body so as to be capable of being lifted and lowered, and is configured to support the transported object from the lower side, and the elastic body that is provided between the base body and the support body and in which the stress equal to the predetermined weight is generated in a case where the support body is lowered to a predetermined lowered position with reference to the base body, characterized in that the weight acting portion further includes a drive section configured to lift the elastic support portion with respect to the vehicle body such that a stress generated in the elastic body becomes the partial weight, the drive section driving the base body to be lifted and lowered. a vehicle body, that includes a traveling wheel, is configured to enter a lower side of a transported object, and is configured to travel while towing the transported object; and a weight acting portion configured to cause, in a case where a total weight of the transported object is larger than a predetermined weight, a partial weight of the total weight equal to or less than the predetermined weight to act on the vehicle body from the transported object, wherein the weight acting portion includes an elastic support portion that is provided on the vehicle body so as to be capable of being lifted and lowered, and is configured to support the transported object from the lower side via an elastic body, wherein the elastic support portion includes a base body that is provided on the vehicle body so as to be capable of being lifted and lowered, a support body that is provided on the base body so as to be capable of being lifted and lowered, and is configured to support the transported object from the lower side, and the elastic body that is provided between the base body and the support body and in which the stress equal to the predetermined weight is generated in a case where the support body is lowered to a predetermined lowered position with reference to the base body, characterized in that the weight acting portion further includes a drive section configured to lift the elastic support portion with respect to the vehicle body such that a stress generated in the elastic body becomes the partial weight, the drive section driving the base body to be lifted and lowered.