The present invention provides particulate titanium oxide and a production process thereof. The particulate titanium oxide comprises mixed crystal titanium oxide containing rutile crystal produced by a vapor phase process, wherein the titanium oxide has a property represented by the following general formula R.gtoreq.1300.times.B.sup.-0.95 wherein R represents a rutile content (%) and B represents a BET specific surface area (m.sup.2/g). The titanium oxide is particulate high-rutile-content titanium oxide with very low aggregation and having a high dispersibility.