1. Device for detecting thermal radiation, having a stack comprising: at least one detector support with at least one thermal detector element in said stack that converts thermal radiation into an electric signal; at least one circuit support in said stack with at least one read-out circuit in said stack to read out the electric signal; at least one cover that shields the detector element; wherein: the detector support is arranged between the circuit support and the cover; the detector support and the cover are arranged with respect to one another to form at least one first stack cavity, bounded by the detector support and the cover, between the detector element of the detector support and the cover; the circuit support and the detector support are arranged with respect to one another to form at least one second stack cavity, bounded by the circuit support and the detector support, between the detector support and the circuit support; and the detector support and the circuit support and/or the detector support and the cover are respectively connected by a hermetically sealed permanent material bond such that the first stack cavity and/or the second stack cavity form an evacuated space.