Abstract: A device for exchangeably attaching tools on an industrial robot comprising an attachment device. According to the invention, the attachment device (1) comprises a first member (2) rigidly attached to the outer portion (4) of a robot arm (3) and a second member (5) intended to be rigidly attached to each of one or several tools (6), by which tools (6) the robot is to carry out operations. The first member (2) comprises an electric coil (10) capable in a magnetic way to attract said second member (5) whereby the members (2.5) are retained to each other when current flows through the coil (10). Said first member (2) and said second member (5) are provided with means (15-18;23,24,26) for transferring electric current and/or compressed air or vacuum or substances between a source connected to the first member (2) and a tool (6) attached to the second member (5).