tokio marine nichido fire insurance co., ltd. (東京海上日動火災保険株式会社, tōkyō kaijō nichidō kasai hoken kabushiki-kaisha), commonly called tokio marine nichido, is a property/casualty insurance subsidiary of tokio marine holdings, the largest non-mutual private insurance group in japan. tokio marine holdings was formerly known as millea group, which underwent a name change in july 2008. its headquarters are in marunouchi, chiyoda, tokyo.[1]