The invention relates to a fluid conductivity measuring cell comprising two cylindrical and coaxial electrodes (2, 3) mounted head-to-tail and axially overlapping on the same insulative material component body, one of the two electrodes (2, 3), referred to as the inner electrode (3), penetrating partly into the other, at least partly hollow electrode, referred to as the outer electrode (2), which cell is characterized in that the body (1) comprises a recess (10) by means of which the two electrodes (2, 3) are accommodated in such a manner as to form two cylindrical spaces, one of which is an external space (6) formed between the internal wall (23) of the recess (10) and the external wall (24) of the external electrode (2) and the other of which is an internal space (7) formed between the external wall (20) of the internal electrode (3) and the internal wall (19) of the external electrode (2), the external space (6) establishing communication between a fluid inlet and a fluid outlet (11a, 11b) of the cell, each discharging into the recess (10) and being in fluid communication with the internal space (7) that it surrounds, this internal space (7) serving as a conductivity measuring area.