There is disclosed a piezoelectric/electrostrictive ceramics which is a sintered body having a structure where a matrix and a filler are brought into a composite, the matrix is made of an alkali niobate-based piezoelectric/electrostrictive material, which includes a large number of grains combined with one another, including a perovskite type oxide, which includes at least one element selected from the group consisting of Li, Na and K as an A site constituent element and Nb as a B site constituent element, as a main crystal phase, the filler is made of a material (with the proviso that an alkali niobate-based material is excluded) having a thermal expansion coefficient smaller than that of the alkali niobate-based piezoelectric/electrostrictive material, and the volume fraction of the filler with respect to the total volume of the matrix and the filler is 0.5 vol % or more and below 10 vol %.