  We have studied the electronic structure of epitaxially grown thin films of
La$_{1-x}$Sr$_x$FeO$_3$ by {\it in-situ} photoemission spectroscopy (PES) and
x-ray absorption spectroscopy (XAS) measurements. The Fe 2$p$ and valence-band
PES spectra and the O $1s$ XAS spectra of LaFeO$_3$ have been successfully
reproduced by configuration-interaction cluster-model calculation and, except
for the satellite structure, by band-structure calculation.From the shift of
the binding energies of core levels, the chemical potential was found to be
shifted downward as $x$ was increased. Among the three peaks in the
valence-band spectra of La$_{1-x}$Sr$_x$FeO$_3$, the peak nearest to the Fermi
level ($E_F$), due to the ``$e_{g}$ band'', was found to move toward $E_F$ and
became weaker as $x$ was increased, whereas the intensity of the peak just
above $E_F$ in the O $1s$ XAS spectra increased with $x$. The gap or pseudogap
at $E_F$ was seen for all values of $x$. These results indicate that changes in
the spectral line shape around $E_F$ are dominated by spectral weight transfer
from below to above $E_F$ across the gap and are therefore highly
non-rigid-band-like.
