PURPOSE: To form a combined ceramics body which is durable and can maintain the desired functions even under serve conditions and is useful for a fluid sensor, etc., by constituting a conducting part with ceramics as a nonconducting part and selecting the ceramics composition so as to equalize the coeffts. of thermal expansion of both.

CONSTITUTION: The following constitution is adopted for the combined ceramics body formed by sintering conductive ceramics and nonconductive ceramics: The conductive ceramics contains 1 or ≥2 kinds among the nitrides, carbides and oxides of group IVa, Va, VIa metals of periodic table and the nonconductive ceramics consists essentially of 1 or ≥2 kinds selected from the group consisting of Al2O3, ZrO2, AlN, B4C, and Si3N4 and contains 1 or ≥2 kinds among the nitrides, carbides and oxides of group IVa, Va, VIa metals of periodic table.