Abstract: By using a surface-modified metal oxide particle material obtained by performing surface modification on a metal oxide particle having an average primary particle diameter of 3 nm or more and 10 nm or less with a surface-modifying material having at least a phenyl group and a group capable of undergoing a crosslinking reaction with a functional group in a silicone resin-forming component, the surface-modified metal oxide particle material which has high heat resistance and may further exhibit high transparency and gas barrier properties when used for a sealing material for optical semiconductor light emitting device, or the like is provided and a dispersion liquid, a silicone resin composition and a silicone resin composite each containing the surface-modified metal oxide particle material, as well as an optical semiconductor light emitting device, a light fitting, and a liquid crystal imaging device each using the silicone resin composite, are also provided.