Piezoelectric ceramics, piezoelectric element, liquid ejection head, ultrasonic motor, and dust removing device

A piezoelectric ceramics, comprising a first crystal grain and a second crystal grain,

• wherein the first crystal grain has an average equivalent circle diameter of 2 μm or more and 30 μm or less,
• wherein the first crystal grain includes a perovskite-type metal oxide represented by general formula (1) as a main component, and the second crystal grain includes a perovskite-type metal oxide represented by general formula (2) as a main component:
• xBaTiO3-yCaTiO3-zCaZrO3;
• and (1)
• x′BaTiO3-y′CaTiO3-z′CaZrO3, (2)
• provided that x, y, z, x′, y′, and z′ satisfy x+y+z=1, x′+y′+z′=1, 0≦x′≦0.15, 0.85≦y′≦1, 0≦z′≦0.05, x>x′, 0<y<y′, and z>0, and
• wherein when the piezoelectric ceramics is polished, the ratio of the area of the first crystal grain in a polished surface of the piezoelectric ceramics is larger than the ratio of the area of the second crystal grain in the polished surface.