Abstract: The present invention relates to an analyzing device (1) used with an analytical tool (2) mounted to the device, where the analytical tool provides a reaction field including sample liquid and includes a first and a second electrodes (20A, 20B) for applying voltage to the reaction field. The analyzing device (1) includes a connector (10) coming into contact with the first and the second electrodes (20A, 20B), an analysis circuit (13) for performing sample analysis based on sample liquid information obtained from the analytical tool (2) through the connector (10), and a disturbing-noise countermeasure unit (11) which absorbs disturbing noise and which is provided closer to the connector (10) than to the analysis circuit (13).