Provided is a piezoelectric-film-type electron emitter which enables suppression of reduction of electron emission quantity due to repeated use thereof, and which exhibits high durability. The electron emitter includes a substrate; an emitter section formed of a dielectric material; a first electrode formed on the top surface of the emitter section; and a second electrode formed on the bottom surface of the emitter section. The dielectric material forming the emitter section contains a dielectric composition having an electric-field-induced strain (i.e., percent deformation under application of an electric field of 4 kV/mm, as measured in a direction perpendicular to the electric field) of 0.07% or less.