Provided is a detection device which includes a detection electrode group including a plurality of first electrodes each of which is configured to detect a detection signal that changes according to touch or approach of an external object, an output signal line, and a selective coupling circuitry configured to couple first electrodes of a first detection target in the detection electrode group with the output signal line according to a first selection signal, output a first output signal obtained by integrating detection signals output from the selected first electrodes of the first detection target to the output signal line, couple first electrodes of a second detection target which are not included in the first detection target in the detection electrode group with the output signal line according to a second selection signal different from the first selection signal, and output a second output signal.