  We present the results of our study of the X-ray emission from the Ophiuchus
galaxy cluster based on INTEGRAL/IBIS data in the energy range 20-120 keV. Our
goal is the search for a nonthermal emission component from the cluster. Using
the INTEGRAL data over the period of observations 2003-2009, we have
constructed the images of the Ophiuchus galaxy cluster in different energy
bands from 20 to 120 keV with the extraction of spectral information. We show
that in the hard X-ray energy band the source is an extended one with an
angular size of 4.9 +/- 0.1 arcmins. Assuming a fixed intracluster gas
temperature of 8.5 keV, a power-law component of the possible nonthermal X-ray
emission is observed at a 5.5 sigma significance level, the flux from which is
consistent with previous studies. However, in view of the uncertainty in
constraining the thermal emission component in the X-ray spectrum at energies
above 20 keV, we cannot assert that the nonthermal emission of the cluster has
been significantly detected. Based on the fact of a confident detection of the
cluster up to 70 keV, we can draw the conclusion only about the possible
presence of a nonthermal excess at energies above 60 keV.
