To provide a fluorinated ether compound, a fluorinated ether composition and a coating liquid, whereby it is possible to form a surface-treated layer which has high initial water/oil repellency and which is excellent in abrasion resistance and fingerprint stain removability, and a substrate having a surface-treated layer and a method for its production. A fluorinated ether compound which has a poly(oxyperfluoroalkylene) chain ((±²) n ) made of at least two units (±²) linked to one another, and which has a hydrolysable silyl group on at least one terminal of the chain ((±²) n ) via a linking group, wherein each unit (±²) is a poly(oxyperfluoroalkylene) group comprising one to three groups (±) made of at least one type of a C 1-2 oxyperfluoroalkylene group and one to three groups (²) made of at least one type of a C 3-6 oxyperfluoroalkylene group.
