1. A labeling machine for a blood-sampling tube automatic preparation device which selectively automatically picks up a blood-sampling tube required for the examination of the patient from blood-sampling tube containing sections on the basis of an information related to one patient that includes examination information, patient information, or both, prints the examination information, patient information, or both on a label on the basis of said information related to one patient so as to make an identification label, pastes the identification label on the blood-sampling tube picked up from the blood-sampling tube containing sections, and collects the blood-sampling tube on which the identification label is pasted into a container for every patient, characterized in that said labeling machine comprises: a supporting means for supporting the blood-sampling tube that is picked up on the basis of the information related to one patient at a label pasting position; a blood-sampling tube driving means for rotating the blood-sampling tube at the label pasting, position; a label printing means for printing the examination information, patient information, or both on the label on the basis of the information related to one patient to make an identification label and for outputting the identification label to the label pasting position; a production label position detection means for detecting an edge of a production label pre-pasted on the surface of the blood-sampling tube at the label pasting position; and a control means for controlling the operations of the label printing means and the blood-sampling tube drive means so as to paste the identification label on the production label remaining a clearance gap continuously extended along the axis direction of the blood-sampling tube on the surface of the blood-sampling tube on the basis of a diameter information of the blood-sampling tube at the label pasting position and the edge information of the production label detected by the production label position detection means.