Spin-spin relaxation of Na-23-NMR is observed by the spin echo method at room temperature for Y-type zeolite loaded with Na metal without hydration. For saturated and no levels of loading, the echo decay is well fitted by single exponential function. T-2 decreases to be 0.25 times smaller by loading, This decrease of T-2 is explained semiquantitatively with assuming nuclear dipole-dipole interaction between neighboring Na.