A device (10, 100, 101, 102) for electrical measurement of a target chemical substance, comprising: one or more electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) each including a base (21d, 23d), an electrode array section (21e, 22e, 23e) in which one or more electrodes (21a, 22a, 23a) which are disposed on the base (21d, 23d) and to each of which a test substance having a bonding property to a target chemical substance is fixed or can be fixed are arrayed, and a terminal array section (21f, 22f, 23f) in which one or more terminals (21b, 22b, 23b) disposed on the base (21d, 23d) so as to correspond to the electrodes (21a, 22a, 23a) and electrically connected to the electrodes (21a, 22a, 23a) are arrayed; a processing head (7, 71, 72, 73) including one or more electrode array element support sections (4 1- 4 n, 41 1 -41 4, 42 1 -42 4, 43 1 -43 4) supporting the electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) detachably to make electrical connection to the terminals (21b, 22b, 23b) possible; a container group (3, 31, 32, 33) including one or more liquid storing sections (3b, 31b, 32b, 33b) storing or capable of storing liquid, and one or more measurement containers (3c, 31c, 32c, 33c); a support section moving mechanism (5, 52, 53, 531) capable of relatively moving the one or more electrode array element support sections (4 1- 4 n, 41 1 -41 4, 42 1 -42 4, 43 1 -43 4) with respect to the container group (3, 31, 32, 33); and a measurement section capable of measuring a signal generated by applying a predetermined voltage to a test substance fixed to each of the electrodes (21a, 22a, 23a) in the measurement containers (3c, 31c, 32c, 33c), wherein the container group (3, 31, 32, 33) includes one or more electrode array element storing sections storing or capable of storing the electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) such that the electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) can be supported by the electrode array element support sections (4 1- 4 n, 41 1 -41 4, 42 1 -42 4, 43 1 -43 4) due to the support section moving mechanism (5, 52, 53, 531). one or more electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) each including a base (21d, 23d), an electrode array section (21e, 22e, 23e) in which one or more electrodes (21a, 22a, 23a) which are disposed on the base (21d, 23d) and to each of which a test substance having a bonding property to a target chemical substance is fixed or can be fixed are arrayed, and a terminal array section (21f, 22f, 23f) in which one or more terminals (21b, 22b, 23b) disposed on the base (21d, 23d) so as to correspond to the electrodes (21a, 22a, 23a) and electrically connected to the electrodes (21a, 22a, 23a) are arrayed; a processing head (7, 71, 72, 73) including one or more electrode array element support sections (4 1- 4 n, 41 1 -41 4, 42 1 -42 4, 43 1 -43 4) supporting the electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) detachably to make electrical connection to the terminals (21b, 22b, 23b) possible; a container group (3, 31, 32, 33) including one or more liquid storing sections (3b, 31b, 32b, 33b) storing or capable of storing liquid, and one or more measurement containers (3c, 31c, 32c, 33c); a support section moving mechanism (5, 52, 53, 531) capable of relatively moving the one or more electrode array element support sections (4 1- 4 n, 41 1 -41 4, 42 1 -42 4, 43 1 -43 4) with respect to the container group (3, 31, 32, 33); and a measurement section capable of measuring a signal generated by applying a predetermined voltage to a test substance fixed to each of the electrodes (21a, 22a, 23a) in the measurement containers (3c, 31c, 32c, 33c), wherein the container group (3, 31, 32, 33) includes one or more electrode array element storing sections storing or capable of storing the electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) such that the electrode array elements (2 1 -2n, 21 1 -21 4, 22 1 -22 4, 23 1 -23 4) can be supported by the electrode array element support sections (4 1- 4 n, 41 1 -41 4, 42 1 -42 4, 43 1 -43 4) due to the support section moving mechanism (5, 52, 53, 531).