A vessel holder for receiving a number of vessels is useful in an automated analyzer. To increase the number of vessels which can be received in the analyzer and to simplify the device for reading bar code labels, the vessel holder has an elongate body manufactured in one piece and containing a single straight row of identical elongate chambers. Each chamber is for receiving one vessel. All chambers have a common base with respect to which they are perpendicularly disposed. Adjacent chambers are separated by a partition. The inside of a side wall of each chamber bears a first bar code label for detecting the absence of a vessel in the chamber, and the outside of a side wall of each chamber bears a second bar code label for detecting the position of the chamber in the vessel holder. The first and the second bar code labels are readable by a bar code reader from one and the same side of the vessel holder.