To provide media for beveling a piezoelectric element, as well as a working method using cylindrical media whose diameter size is almost the same as its height size, and whose largest size is 50% to 100% of the maximum size of the piezoelectric material.

To attain the aforementioned purpose, the piezoelectric material, a polishing agent, and the media are put in a container, and beveling of the piezoelectric material is carried out by rotating the container. The media used in beveling the piezoelectric material through the rotational driving of this container is a cylindrical-shaped product, whose diameter size is almost equal to its height size, and the largest size of the media is also 50% to 100% of the piezoelectric material. In the beveling of piezoelectric material based on the use of the media, a screen-shaped sieve is utilized for exchanges of polishing agent in the course of beveling, as well as for polishing agent separation upon termination of beveling work.