The external surface of a mesoporous silica, MCM-41, was functionalized with phenyl groups to obtain dual domain mesoporous silica particles (hydrophobic particle surface and hydrophilic mesopore) for a platform for the photochromism of merocyanine/spiropyran. Merocyanine was adsorbed on MCM-41 with that functionalized with phenyl groups by photoinduced adsorption. The red hybrid of Ph-MCM-41 showed negative photochromism with a higher decolorization efficiency and a faster thermal colorization than the hybrid of MCM-41, suggesting the photogenerated spiropyran diffused into the hydrophobic surface.