Induction heating device (52a-h) for a shrink-clamping and/or unshrink-unclamping of tools (10a-h) into and/or out of tool holders (12a-h), with an induction heating unit (14a-h) comprising at least one first inductor (16a-h) and at least one second inductor (18a-h) which is preferably realized separately from the first inductor (16a-h), wherein the first inductor (16a-h) and the second inductor (18a-h) are configured to respectively expand at least a portion, in particular different portions, of the tool holder (12a-h) by inductive heating in a shrink-clamping and/or unshrink-unclamping process, and with an electric supply unit (20a-h), characterized in that the inductors (16a-h, 18a-h) are configured to output respectively different energies to different subregions (22a-h, 24ah) of a tool holder (12a-h), which are in a heating operation respectively encompassed by the inductors (16a-h, 18a-h), as one of the inductors (16a-h, 18a-h) has more windings (26a-h) than the other inductor (16a-h, 18a-h), in particular by at least 10 %, preferably by at least 20 % and preferentially by at least 30 % more windings (26a-h), and/or as the electric supply unit (20a-f; 20h) is at least configured to operate the first inductor (16a-f; 16h) and the second inductor (18a-f; 18h) in different manners, wherein the first inductor (16a-b; 16d-h) and the second inductor (18a-b; 18d-h) are arranged in the induction heating unit (14a-b; 14d-h) such that they are closely adjacent to each other and wherein a total winding height (38a-h) of the two inductors (16a-h, 18a-h) in an axial direction (34a-h) of the induction heating unit (14a-h) is smaller than a maximum standardized clamp-in length (40a-h) of the tool holders (12a-h). with an induction heating unit (14a-h) comprising at least one first inductor (16a-h) and at least one second inductor (18a-h) which is preferably realized separately from the first inductor (16a-h), wherein the first inductor (16a-h) and the second inductor (18a-h) are configured to respectively expand at least a portion, in particular different portions, of the tool holder (12a-h) by inductive heating in a shrink-clamping and/or unshrink-unclamping process, and with an electric supply unit (20a-h), characterized in that the inductors (16a-h, 18a-h) are configured to output respectively different energies to different subregions (22a-h, 24ah) of a tool holder (12a-h), which are in a heating operation respectively encompassed by the inductors (16a-h, 18a-h), as one of the inductors (16a-h, 18a-h) has more windings (26a-h) than the other inductor (16a-h, 18a-h), in particular by at least 10 %, preferably by at least 20 % and preferentially by at least 30 % more windings (26a-h), and/or as the electric supply unit (20a-f; 20h) is at least configured to operate the first inductor (16a-f; 16h) and the second inductor (18a-f; 18h) in different manners, wherein the first inductor (16a-b; 16d-h) and the second inductor (18a-b; 18d-h) are arranged in the induction heating unit (14a-b; 14d-h) such that they are closely adjacent to each other and wherein a total winding height (38a-h) of the two inductors (16a-h, 18a-h) in an axial direction (34a-h) of the induction heating unit (14a-h) is smaller than a maximum standardized clamp-in length (40a-h) of the tool holders (12a-h).