Electric potential measuring device and method for manufacturing electric potential measuring device

An electric potential measuring device comprising:

• a plurality of readout electrodes in an array form, wherein
• each read electrode of the plurality of readout electrodes is configured to detect an electric potential of an action potential generation point, and
• the electric potential is generated by an action of a cell;
• an insulating member;
• a metal member;
• a reference electrode configured to detect a reference potential, wherein the reference electrode is within the array of the plurality of readout electrodes;
• and
• an amplification section configured to obtain a potential difference between the detected electric potential and the detected reference potential, wherein
• each readout electrode has a covered region and an opened region,
• the metal member and the insulating member are present on the covered region of each readout electrode,
• the metal member and the insulating member are absent on the opened region of each readout electrode, and
• each readout electrode has, in the opened region, at least one high portion with a first height and at least one low portion with a second height,
• the first height is higher than second height with a stacking surface of a corresponding readout electrode with the insulating member as a standard.

A method for manufacturing an electric potential measuring device, the method comprising:

• stacking an insulating member on a readout electrode;
• forming, on the readout electrode, an opened region where the insulating member is not stacked;
• performing an electrochemical oxidation-reduction cycle on the readout electrode having the opened region;
• and
• forming, on a surface of the opened region, at least one high portion with a first height and at least one low portion with a second height, wherein the first height is higher than the second height with a stacking surface of the readout electrode with the insulating member as a standard.

A method for manufacturing an electric potential measuring device, the method comprising:

• stacking a metal member and an insulating member in this order on a readout electrode;
• forming, on the readout electrode, an opened region where the metal member and the insulating member are not stacked;
• performing an electrochemical oxidation-reduction cycle on the readout electrode having the opened region;
• and
• forming, on a surface of the opened region, at least one high portion with a first height and at least one low portion with a second height, wherein the first height is higher than the second height with a stacking surface of the readout electrode with the metal member as a standard.