  We present the results of our study of the X-ray pulsar IGR J21343+4738 based
on NuSTAR, Swift, and SRG observations in the wide energy range 0.3 - 79 keV.
The absence of absorption features in the energy spectra of the source, both
averaged and phase-resolved ones, has allowed us to estimate the upper and
lower limits on the magnetic field of the neutron star in the binary system,
$B<2.5\times10^{11}$G and $B>3.4 \times 10^{12}$G, respectively. The spectral
and timing analyses have shown that IGR J21343+4738 has all properties of a
quasi-persistent X-ray pulsar with a pulsation period of $322.71\pm{0.04}$s and
a luminosity $L_{x} \simeq3.3$ $\times10^{35}$erg s$^{-1}$. The analysis of the
long-term variability of the object in X-rays has confirmed the possible
orbital period of the binary system $\sim 34.3$ days previously detected in the
optical range.
