Abstract: A tool changer for a deep hole drilling tool which has an internal passage for supplying or removing lubricating oil is described. The deep hole drilling tool is received such that it is adjustable in length in a tool receptacle, which on its receiving part has a groove which is engaged by clamping elements. These elements are provided in pivotable fashion in a tool adapter to which the receiving part belongs. They are held in the clamping position by spring-loaded parts and can by unlocked via a shifting sleeve counter to the force of the springs.