Abstract: Tool-changing system, storage device for this purpose and method for coupling a tool to a robot arm. The invention relates to a tool-changing system for an industrial robot, with a robot-side coupling device (100) provided in a robot arm, with at least one tool (70a, 70b) couplable to the robot-side coupling device (100) and having a tool-side coupling device (76a, 76b), and with a storage device (10) for receiving the at least one tool (76a, 76b) in the non-coupled state. The invention relates, furthermore, to a storage device suitable for this purpose and to a coupling method which can be carried out by means of the tool-changing system. According to the invention, the storage device comprises a base (12), securing means (32a, 32b) for securing the robot-side coupling device (100) and feeding means (50a, 50b) which are designed for generating a relative movement of the robot-side coupling device (100) and of the tool-side coupling device (76a, 76b) with respect to one another in a coupling direction (2).