The number of terminals is reduced while ensuring detection accuracy of a detection target. An electrochemical detection device according to an embodiment comprises a plurality of working electrodes. The plurality of working electrodes are electrodes positioned apart from each other in a liquid region supplied with a liquid used for the electrochemical detection of a detection object, and are electrodes for detecting a current generated by an electrochemical reaction in the liquid region. The plurality of working electrodes are connected to a common working electrode terminal. Fig. 7

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