  The dipping X-ray source 4U 1822$-$37 was observed by Suzaku on 2006 Octrober
20 for a net exposure of 37 ks. The source was detected with the XIS at a 1-10
keV flux of 5.5$\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$, and with the HXD
(HXD-PIN) at a 10-50 keV flux of 8.9$\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$.
With HXD-PIN, the pulsation was detected at a barycentric period of 0.592437 s,
and its change rate was reconfirmed as $-2.43\times$10$^{-12}$ s s$^{-1}$. The
1-50 keV spectra of 4U 1822-37 were found to be very similar to those of Her
X-1 in the slopes, cutoff and iron lines. Three iron lines (Fe K$\alpha$, Fe
XXV, and Fe XXVI) were detected, on top of a 1-50 keV continuum that is
described by an NPEX model plus a soft blackbody. In addition, a cyclotron
resonance scattering feature was detected significantly ($>99\%$ confidence),
at an energy of 33$\pm$2 keV with a depth of 0.4$^{+0.6}_{-0.3}$. Therefore,
the neutron star in this source is concluded to have a strong magnetic field of
2.8$\times10^{12}$ G. Further assuming that the source has a relatively high
intrinsic luminosity of several times 10$^{37}$ erg s$^{-1}$, its spectral and
timing properties are consistently explained.
