A device for transferring sample vessels carried by a microtiter member to collecting vessels which are carried in cassettes and are dimensioned to accommodate the sample vessels. The device is composed of a table provided with a distributor plate for receiving and supporting the microtiter member and which is provided with openings corresponding in number to the number of sample vessels, each opening being located to lie below a respective one of the sample vessels when the microtiter member is supported by the plate; an intermediate plate disposed below the distributor plate and provided with a plurality of openings equal in number to the openings in the distributor plate and each associated with a respective distributor plate opening; a distributor system extending between the distributor plate and the intermediate plate for transferring a respective sample vessel from each distributor plate opening to its associated intermediate plate opening; and a base plate disposed below the intermediate plate for the orderly accommodation of the cassettes in a manner such that each collecting vessel is located below a respective intermediate plate opening.