  Gamma rays from young pulsars and milli-second pulsars are expected to
contribute to the diffuse gamma-ray emission measured by the {\it Fermi} Large
Area Telescope (LAT) at high latitudes. We derive the contribution of the
pulsars undetected counterpart by using information from radio to gamma rays
and we show that they explain only a small fraction of the isotropic diffuse
gamma-ray background.
