Piezoelectric/electrostrictive ceramic composition and displacement generating device

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Provided is piezoelectric/electrostrictive body generating large electric-field-induced strain, and having high durability with respect to an electric field having a direction opposite to a polarization direction. A composition of piezoelectric/electrostrictive ceramics is represented by a general formula Pb a {Zn b Sb c (Zr d Ti 1-d ) 1-b-c }O 3 . As for a, b, c, and d, 0.985 ‰¤ a ‰¤ 0.998, 0.010 ‰¤ b ‰¤ 0.040, 0.025 ‰¤ c ‰¤ 0.090, 0.460 ‰¤ d ‰¤ 0.510, and 2.125 ‰¤ c/b ‰¤ 3.000 are satisfied. An accessory component containing at least one element selected from the group consisting of Mn, Cr, Fe, and a rare-earth element may be added to a main component. An additive amount of the at least one element relative to 100 parts by weight of the main component is 0.3 parts by weight or less in terms of an oxide.