Abstract: Apparatus for handling test-sample carriers in the form of elongate rectangular containers, each of which can accommodate a number of test-sample holders to be brought to a treatment station one after the other, comprises a rectangular table having two adjacently situated longitudinally extending zones each provided with a pair of parallel longitudinally extending conveyor belts respectively movable in opposite directions. The containers loosely rest in a transverse position on such belts by means of protrusions provided on their undersides. At the end of each zone, a stop is provided for arresting the containers. For the transverse displacement of the containers, on each end of the table there is provided a pin or roller which is eccentrically connected to a rotatable shaft such that the pin or roller can perform a rotary movement in the plane of the sidewall of a container bearing against the stop and which cooperates with slot-shaped recesses provided in the relevant sidewall of each container.