An electrochemical measurement system for electrochemically measuring a biological sample with using a measuring liquid having conductivity, the electrochemical measurement system comprising: an electrochemical measurement device (30, 301, 310, 320, 330, 330A, 340, 350, 360); and an electrochemical measuring apparatus, wherein the electrochemical measurement device (30, 301, 310, 320, 330, 330A, 340, 350, 360) includes: a plate having an upper surface (22, 322), the plate having a first well and a second well (25, 251) which are provided in the upper surface (22, 322) at positions different from each other, the first well having a bottom surface, the second well (25, 251) having a bottom surface, the plate including a wall separating the bottom surface of the first well from the bottom surface of the second well (25, 251); a measuring electrode disposed inside the first well; a counter electrode disposed inside the second well (25, 251); and a placement portion provided on the bottom surface of the first well, the placement portion being configured to have the biological sample placed thereon, wherein the measuring electrode is provided around the placement portion on the bottom surface of the first well, wherein the first well and the second well (25, 251) are configured to contain the measuring liquid therein, wherein, when the first well and the second well (25, 251) contain the measuring liquid therein, a portion of the measuring liquid contained in the first well is electrically connected to a portion of the measuring liquid contained in the second well (25, 251), wherein the electrochemical measuring apparatus includes: a control unit that is configured to apply a potential to the measuring electrode; a measuring unit that is configured to measure a current flowing in the measuring electrode; and a calculation unit that is configured to calculate an amount of an activity of the biological sample based on the measured current, wherein the plate has a communicating passage (35, 331, 341) therein, the communicating passage (35, 331, 341) communicating with the first well above the bottom surface of the first well to allow the first well to communicate with the second well (25, 251), characterized in that a plurality of measuring electrodes is provided around the placement portion. an electrochemical measurement device (30, 301, 310, 320, 330, 330A, 340, 350, 360); and an electrochemical measuring apparatus, wherein the electrochemical measurement device (30, 301, 310, 320, 330, 330A, 340, 350, 360) includes: a plate having an upper surface (22, 322), the plate having a first well and a second well (25, 251) which are provided in the upper surface (22, 322) at positions different from each other, the first well having a bottom surface, the second well (25, 251) having a bottom surface, the plate including a wall separating the bottom surface of the first well from the bottom surface of the second well (25, 251); a measuring electrode disposed inside the first well; a counter electrode disposed inside the second well (25, 251); and a placement portion provided on the bottom surface of the first well, the placement portion being configured to have the biological sample placed thereon, a plate having an upper surface (22, 322), the plate having a first well and a second well (25, 251) which are provided in the upper surface (22, 322) at positions different from each other, the first well having a bottom surface, the second well (25, 251) having a bottom surface, the plate including a wall separating the bottom surface of the first well from the bottom surface of the second well (25, 251); a measuring electrode disposed inside the first well; a counter electrode disposed inside the second well (25, 251); and a placement portion provided on the bottom surface of the first well, the placement portion being configured to have the biological sample placed thereon, wherein the measuring electrode is provided around the placement portion on the bottom surface of the first well, wherein the first well and the second well (25, 251) are configured to contain the measuring liquid therein, wherein, when the first well and the second well (25, 251) contain the measuring liquid therein, a portion of the measuring liquid contained in the first well is electrically connected to a portion of the measuring liquid contained in the second well (25, 251), wherein the electrochemical measuring apparatus includes: a control unit that is configured to apply a potential to the measuring electrode; a measuring unit that is configured to measure a current flowing in the measuring electrode; and a calculation unit that is configured to calculate an amount of an activity of the biological sample based on the measured current, a control unit that is configured to apply a potential to the measuring electrode; a measuring unit that is configured to measure a current flowing in the measuring electrode; and a calculation unit that is configured to calculate an amount of an activity of the biological sample based on the measured current, wherein the plate has a communicating passage (35, 331, 341) therein, the communicating passage (35, 331, 341) communicating with the first well above the bottom surface of the first well to allow the first well to communicate with the second well (25, 251), characterized in that a plurality of measuring electrodes is provided around the placement portion.