Patent ID: 7830073

Claim:
A perovskite oxide represented by a general formula ABO 3 , wherein A represents at least one kind of metal element forming an A site, B represents at least one kind of metal element forming a B site, O represents an oxygen atom and the number of moles of elements of each of the A and B cites may deviate from 1.0 in the range where perovskite structure is held though the number of moles of elements of each of the A and B sites is 1.0 by standard, wherein the improvement comprises that the B site includes at least one kind of metal element B1 selected from an element group consisting of the IV group elements and at least one kind of metal element B2 selected from an element group consisting of the V and VI group elements, and at least a part of the metal element B2 is of the 0 to +4 valence.