[Problem] To provide an automatic preparation device that is for a blood collection tube and that can detect mistakes of blood collection tube type. [Solution] The automatic preparation device for a blood collection tube is configured in a manner so that, on the basis of instruction information from a physician, a blood collection tube needed for collecting the blood of a patient is selectively removed, the removed blood collection tube is sent to a label-pasting position, information relating to the patient is printed to a label by means of a label printer, then the label is pasted to the blood collection tube that is at the label-pasting position, and the blood collection tube after label pasting is housed in a housing means for each patient. The automatic preparation device for a blood collection tube is characterized by: being provided with an imaging means that images the outer appearance of a blood collection tube removed from the housing means for the blood collection tube； and a control means being configured in a manner so as to have a threshold for characteristic information relating to at least one outer feature that can be elicited from the outer features of the blood collection tubes ahead of time, extract characteristic information relating to the outer feature from the outer appearance image of the blood collection tube imaged by the imaging means, specify the type of the blood collection tube on the basis of the extracted characteristic information and the threshold, and determine whether or not the blood collection tube is the blood collection tube that is on the basis of the instruction information.La présente invention vise à fournir un dispositif de préparation automatique qui est destiné un tube de prélèvement de sang et qui peut détecter les erreurs de type de tube de prélèvement de sang. La présente invention concerne par conséquent un dispositif de préparation automatique d'un tube de prélèvement sanguin qui est configuré de telle manière que
