A piezoelectric ceramic composition in which the mechanical quality factor Qm and the electromechanical coupling factor Kp are superior, and a high power output piezoelectric transformer made of it are disclosed. The piezoelectric ceramic composition according to the present invention is composed of Pb1−aSra [(Ni1/2W1/2)b(Mn1/3Nb2/3)c(Zr1−xTix)1−b−c]O3+kPbO, where a is 0-0.06 mol %, b is 0.01−0.05 mol %, c is 0.01-0.09 mol %, x is 0.47-0.53 mol %, and k is 0.1-0.7 wt %. The piezoelectric transformer according to the present invention includes: a piezoelectric block composed of the same composition; a first electrode consists of an inner electrode and an outer electrode, the inner electrode being formed at a center of a top of the piezoelectric block, and the outer electrode being formed around the inner electrode by being separated by an isolating region; a second electrode is formed on the bottom of the piezoelectric block.