NOx analyzer, manufacturing method thereof and NOx measurement device with the NOx analyzer

A NOx sensing cell (40) comprises a solid electrolyte (31) having oxide ion conductivity and a pair of the solid electrolyte (31) electrically connected to electrodes (41, 42). The Messel electrode (41) has an oxide content and a noble metal component. The oxide contains a mixed crystal of at least ceria-containing zirconium oxide. The noble metal component contains at least two kinds of platinum group metal elements selected. In addition to the NOx analyzer (40) comprises a NOx measuring device (30) comprises a measuring chamber into which a measurement target gas is introduced (60), and an oxygen pumping cell (50) which is capable of the oxygen electrochemical (from the measurement chamber remove 60). The Messeleketrode (41) of the NOx analyzer (40) located in the measuring chamber (60).