To find a simple method for predicting the post-earthquake settlement of clay layer, the settlement characteristics in the recompression stage following the undrained cyclic shear were observed. Tested samples were kaoline and reconstituted marine clays. In conclusion, 1) the smaller the plasticity index of clay, the larger the decrease in effective stress during the cyclic shear and also the larger settlement during the recompression stage was observed, 2) when the amplitude of cyclic shear strain is small, the settlement-time relations are similar to those for the over consolidated clay, 3) the apparent earthquake-induced subsidence in the alluvial clay layer in the Port Island, Kobe, Japan, was observed.