Sulfurization detection resistor and manufacturing method therefor

A sulfurization detection resistor manufacturing method comprising:

• a front electrode forming step of forming multiple pairs of opposing front electrodes in a separated state at both ends on a main surface of an insulated substrate;
• a series circuit section forming step of forming resistive elements and sulfurization detecting conductors such that each resistive element and each sulfurization detecting conductor are connected in series between the multiple pairs of the front electrodes, respectively;
• a resistance value trimming step of bringing probes into contact with the multiple pairs of the front electrodes and adjusting a resistance value of each individual one of the multiple resistive elements;
• and
• after the resistance value trimming step, a protective film forming step of forming a protective film to entirely cover the resistive elements and partially cover the sulfurization detecting conductors, wherein the resistive elements and the sulfurization detecting conductors are comprised in the multiple series circuit sections,
• wherein, in the protective film forming step, sulfurization detecting portions are defined to be exposed out of the protective film respectively in the sulfurization detecting conductors comprised in the multiple series circuit sections, and different timings are set for the multiple sulfurization detecting portions respectively to become disconnected depending on a cumulative amount of sulfurization.