  The PAMELA satellite borne experiment is designed to study cosmic rays with
great accuracy in a wide energy range. One of PAMELA's main goal is the study
of the antimatter component of cosmic rays. The experiment, housed on board the
Russian satellite Resurs-DK1, was launched on June 15th 2006 and it is still
taking data. In this work we present the measurement of galactic positron
energy spectrum in the energy range between 500 MeV and few hundred GeV.
