3D input device, in particular a mobile 3D input device, comprising: a housing; an input element arranged in the housing, the input element having a first side and a second side opposite the first side; and a sensor device; wherein the input element is movable in six components relative to the housing, namely three displacements and three angular rotations in and about the three axes of a Cartesian coordinate system, respectively; wherein the sensor device detects the movement of the input element relative to the housing; and wherein the first side or the second side or both sides (42, 44) together are configured such that a user can perform a movement of the input element along the six components by an action on the first side and/or the second side, and wherein the 3D input device comprises at least one spring device, the spring device being connected with the housing and the input element such that the input element, when in a rest position, has a fixed position relative to the housing, characterized in that the sensor device comprises at least six sensor units (62, 63), wherein each of the at least six sensor units comprises: at least one one-dimensional magneto-resistive sensor (64, 65), and at least one magnetic transmitter (66, 67) associated to this sensor (66, 67); each of the at least six sensor units (62, 63) detecting at least one component of the movement of the input element relative to the housing, and wherein the spring device comprises exactly one or two elastic mats. a housing; an input element arranged in the housing, the input element having a first side and a second side opposite the first side; and a sensor device; wherein the input element is movable in six components relative to the housing, namely three displacements and three angular rotations in and about the three axes of a Cartesian coordinate system, respectively; wherein the sensor device detects the movement of the input element relative to the housing; and wherein the first side or the second side or both sides (42, 44) together are configured such that a user can perform a movement of the input element along the six components by an action on the first side and/or the second side, and wherein the 3D input device comprises at least one spring device, the spring device being connected with the housing and the input element such that the input element, when in a rest position, has a fixed position relative to the housing, characterized in that the sensor device comprises at least six sensor units (62, 63), wherein each of the at least six sensor units comprises: at least one one-dimensional magneto-resistive sensor (64, 65), and at least one magnetic transmitter (66, 67) associated to this sensor (66, 67); each of the at least six sensor units (62, 63) detecting at least one component of the movement of the input element relative to the housing, and wherein the spring device comprises exactly one or two elastic mats. at least one one-dimensional magneto-resistive sensor (64, 65), and at least one magnetic transmitter (66, 67) associated to this sensor (66, 67); each of the at least six sensor units (62, 63) detecting at least one component of the movement of the input element relative to the housing, and wherein the spring device comprises exactly one or two elastic mats.