Device for verifying a machine-readable security feature of a document of value (3; 3-1, 3-2), wherein the device has: • a transport device configured to transport the document of value (3; 3-1, 3-2) through the device on a transport plane (TE) in a transport direction (TR), wherein a first flat side and a second flat side , opposite said first flat side, of the document of value (3; 3-1, 3-2) extend parallel to the transport plane (TE), • a radiation emitter (9; 9-1, 9-2) that is arranged on the first flat side and is configured to emit at least infrared radiation in the direction towards the first flat side , wherein the emitted radiation is configured to excite luminescent radiation of the security feature of the document of value (3; 3-1, 3-2), and the emitted radiation is further configured to pass at least partly through the document of value , • a sensor that is arranged on the first flat side and is configured to receive at least part of the luminescent radiation and of the emitted radiation, • a reflector that is arranged and configured on the second flat side so as to reflect the emitted radiation, passing through the document of value (3; 3-1, 3-2), of the radiation emitter (9; 9-1, 9-2) and the luminescent radiation of the security feature of the document of value (3; 3-1, 3-2) at least partly to the sensor , and • an evaluation unit configured to control the radiation emitter (9; 9-1, 9-2) and to receive the signals output by the sensor , wherein the radiation emitter (9; 9-1, 9-2) has a first component radiation emitter (9-1) and a second component radiation emitter (9-2) and the sensor is a photodiode, is tuned to the spectrum of the radiation emitter (9; 9-1, 9-2) and is arranged between the first component radiation emitter (9-1) and the second component radiation emitter (9-2) along a direction transverse to the transport direction. • a transport device configured to transport the document of value (3; 3-1, 3-2) through the device on a transport plane (TE) in a transport direction (TR), wherein a first flat side and a second flat side , opposite said first flat side, of the document of value (3; 3-1, 3-2) extend parallel to the transport plane (TE), • a radiation emitter (9; 9-1, 9-2) that is arranged on the first flat side and is configured to emit at least infrared radiation in the direction towards the first flat side , wherein the emitted radiation is configured to excite luminescent radiation of the security feature of the document of value (3; 3-1, 3-2), and the emitted radiation is further configured to pass at least partly through the document of value , • a sensor that is arranged on the first flat side and is configured to receive at least part of the luminescent radiation and of the emitted radiation, • a reflector that is arranged and configured on the second flat side so as to reflect the emitted radiation, passing through the document of value (3; 3-1, 3-2), of the radiation emitter (9; 9-1, 9-2) and the luminescent radiation of the security feature of the document of value (3; 3-1, 3-2) at least partly to the sensor , and • an evaluation unit configured to control the radiation emitter (9; 9-1, 9-2) and to receive the signals output by the sensor , <EOS>