  We report the spin texture formation resulting from the magnetic
dipole-dipole interaction in a spin-2 $^{87}$Rb Bose-Einstein condensate. The
spinor condensate is prepared in the transversely polarized spin state and the
time evolution is observed under a magnetic field of 90 mG with a gradient of 3
mG/cm using Stern-Gerlach imaging. The experimental results are compared with
numerical simulations of the Gross-Pitaevskii equation, which reveals that the
observed spatial modulation of the longitudinal magnetization is due to the
spin precession in an effective magnetic field produced by the dipole-dipole
interaction. These results show that the dipole-dipole interaction has
considerable effects even on spinor condensates of alkali metal atoms.
