5 u03b8max is disadvantageously small whereas when firing the temperature is higher than about 1245 u00b0 c as in the case of sample no 6 or 7 the third order vibration response 3 u03b8max is also suppressed which is disadvantageous in a manner similar to that described in example 1 a calcined pbtio 3 product was produced the calcined pbtio 3 was crushed and tio 2 powder was added thereto and mixed therewith a binder was added to and mixed with the resultant crushed product to thereby obtain a binder containing mixture the binder containing mixture was compression molded into a flat plate under a pressure of 4 ton cm 2 so as to obtain a compact the compact was fired at 1180 u00b0 c to thereby obtain the piezoelectric ceramic of the present invention electrodes were formed on the two main surfaces of the piezoelectric ceramic to thereby obtain a piezoelectric ceramic element the resultant piezoelectric ceramic was subjected to measurement as described in example 1 to thereby confirm that the tio 2 crystalline phase was present in pbtio 3 serving as the primary component of the piezoelectric ceramic and that the fifth order vibration response 5 u03b8max of the piezoelectric ceramic was suppressed a resin molding type piezoelectric oscillator will next be described however the piezoelectric oscillator of the present invention is not limited only to this type of resonator as illustrated in fig1 electrodes 3 b were formed on the two main surfaces of a piezoelectric ceramic 3 a obtained from example 1 or 2 to thereby obtain a piezoelectric ceramic element 3 subsequently an insulating substrate.