To provide an ammonium silane-modified silicon-containing particle which can control a zeta electric potential to be any value and is useful as a display particle for a display element utilizing electrophoresis and to provide a display liquid containing the particle and an electrophoretic display element using the display liquid.

The ammonium silane-modified silicon-containing particle is obtained by reacting a silicon-containing particle and, for example, octadecyldimethyl (3-trimethoxysilylpropyl) ammonium chloride. The display liquid for electrophoretic display device using the particle and the electrophoretic display element containing the display liquid are also provided.