An in-plane switching liquid crystal display device is designed in such a way that an angle defined by the lengthwise direction of a common electrode and a pixel electrode and a rubbing direction of an alignment layer is set to 10 to 20.degree., a cell gap d is set to 2.7 .mu.m or smaller, the dielectric anisotropy .DELTA..di-elect cons. of a liquid crystal constituting a liquid crystal layer is set to 8 to 20, a white voltage V.sub.white to be applied to the pixel electrode when displaying white is set to 4 to 7 V, and the white voltage V.sub.white (V), the dielectric anisotropy .DELTA..di-elect cons. of the liquid crystal, the cell gap d (.mu.m) and an interval L (.mu.m) between the common electrode and the pixel electrode satisfy the following expression.>.times..times..DELTA..times..times.> ##EQU00001##