ABSTRACT
In this chapter, we review recent progress in angle-resolved
photoemission spectroscopy (ARPES) studies of iron-pnictide su-
perconductors, by particularly focusing on the experimental results
on the BaFe2As2 system where the ARPES investigations have
been most intensively performed. We discuss (i) the evolution
of the Fermi surface topology upon electron-and hole-carrier
doping, (ii) the superconducting-gap symmetry, (iii) the many-body
interactions, and (iv) the electronic states in the antiferromagnetic
phase of a parent compound, as well as their implications to the
mechanism of superconductivity.