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 (αβ) having a C4 oxyperfluoroalkylene unit (α) and an oxyperfluoroalkylene unit (β) other than the unit (α) and which has a hydrolysable silyl group on at least one terminal of the poly(oxyperfluoroalkylene) chain (αβ) via a linking group.