A belt holder device is provided having a housing having a first fixing device, a plate having a second fixing device mounted on the housing for displacement in a displacement direction, wherein the belt holder device is held on an application via one fixing device and a belt is held on the other fixing device, a transmitter-sensor device arranged in the housing and by which the relative position of the plate to the housing is determinable, and a spring device via which the plate is supported on the housing and which provides a return force, wherein the spring device is formed by a flexural spring device, wherein the transmitter is integrated in the plate, wherein the transmitter is arranged in a recess of the plate, and wherein the transmitter in the recess is a magnet and is surrounded by a magnetically insulating enclosure.