  For the metallic nanoparticles, smaller than the free electron path, an
impact of the particle's surface on the nonlocal effects emerging is shown.
Light-induced current inside the particle begins to depend on the spatial
derivatives of the field that leads to modification of Maxwell's equations.
Consequently, the results of Mie theory as well as definitions of the
dielectric function and optical conductivity should be revisited. For the
sphere-shaped nanoparticle, the explicit expression for the high-frequency
current with account of nonlocality is obtained. The dependence of the nonlocal
contribution on the light frequency and particle's size is discussed.
