Cell measuring vessel, extracellular potential measuring method, and chemical testing method

A cell measuring container comprising:

• a housing chamber being opened at its upper face;
• and
• a detecting section having a measuring electrode and a reference electrode extending from a lower end portion of the housing chamber to upward;
• wherein
• the housing chamber has a diameter reduced portion, which diameter of an inner circumferential surface is reduced from an upper end side toward a lower end side and a through hole which passes through a lower end portion of the diameter reduced portion in upward and downward directions, wherein
• the detecting section is formed so as to cover, with an insulating portion, an outer circumferential surface of a bar-like reference electrode, except an upper end portion and lower end portion, and so as to cover an outer circumferential surface of a lower portion of the insulating portion with the measuring electrode, and wherein
• an upper end side of the measuring electrode inserted fluid-tight into the inserting hole faces the inside portion of the housing chamber, a lower end side protrudes to downward for the housing chamber, and an upper end portion of the reference electrode is positioned in the housing chamber.

A cell measuring container comprising:

• a housing chamber being opened at its upper face;
• and
• a wiring substrate having a measuring electrode, a reference electrode, and the housing chamber;
• wherein
• the housing chamber has a large diameter portion extending downward from an upper end opening and a small diameter portion extending downward from the large diameter portion through a step difference;
• and
• the small diameter portion has a diameter reduced portion which diameter of an inner face is reduced from an upper end side to a lower end side and which lower end opening is faced by the measuring electrode, and on an upper face of the step difference portion is mounted an upper opening of a through hole extending apart from the small diameter portion and the lower end opening of the through hole is faced by the reference electrode.