According to an aspect of the present invention, there is provided a sintered electroconductive oxide containing a perovskite phase of perovskite-type crystal structure represented by the composition formula: M1.sub.aM2.sub.bM3.sub.cAl.sub.dCr.sub.eO.sub.f where M1 is at least one of elements of group 3A other than La; M2 is at least one of elements of group 2A; M3 is at least one of elements of groups 4A, 5A, 6A, 7A and 8 other than Cr; and a, b, c, d, e and f satisfy the following conditional expressions: 0.600.ltoreq.a.ltoreq.1.000; 0.ltoreq.b.ltoreq.0.400; 0.150.ltoreq.c<0.600; 0.400.ltoreq.d.ltoreq.0.800; 0