To provide a multiple conductivity measuring device capable of measuring, with high reliability, high precision and high sensitivity, the minute difference or change of the conductivity between plural measuring points different in the position or in the time.

This multiple conductivity measuring device is characterized by having two or more conductivity measuring cells having respectively two or more electrodes in contact with a material to be measured, and connecting electrically the conductivity measuring cells so as to enable at least either processing of addition and subtraction of a detection signal itself from each conductivity measuring cell.