An object of the present invention is to provide a thick film resistor excluding a toxic lead component from a conductive component and glass and having characteristics equivalent to or superior to conventional resistors in terms of, in a wide resistance range, resistance values, TCR characteristics, current noise characteristics, withstand voltage characteristics and the like. The present invention is a thick film resistor formed of a fired product of a resistive composition, wherein the thick film resistor contains ruthenium-based conductive particles containing ruthenium dioxide and a glass component being essentially free of a lead component and has a resistance value in the range of 100 / to 10 M/ and a temperature coefficient of resistance within 100 ppm/ C.

A composite that includes multiple first metal oxide particles containing at least one metal element that is at least one of Mn or Ni, and a first amorphous phase between the multiple first metal oxide particles and which contains the at least one first metal element.