In order to reliably supply a lubrication liquid to a lubricating brush portion by a simple configuration, a tire lubricator device of a tire testing machine of the present invention includes a lubricating brush portion that contacts a bead portion of a rotating tire and applies a lubrication liquid thereto; a tank that hermetically stores the lubrication liquid therein; a first pipe that connects the tank to the lubricating brush portion so as to supply the lubrication liquid stored in the tank to the lubricating brush portion; and a second pipe that is connected to the tank so as to supply pressurized air into the tank from the outside.