A water and oil repellent composition having excellent durability, which
can impart excellent water and oil repellency to an object, even in a
process at low temperatures, and which enables water and oil repellent
treatment providing a soft hand. A water and oil repellent composition
which comprises, as an essential component, a copolymer containing
polymerization units of the following monomer (a) and polymerization
units of the following monomer (b): monomer (a): an R.sup.f
group-containing monomer which forms a photopolymer having no melting
point or a melting point of at most 55.degree. C. attributable to fine
crystals derived from the R.sup.f groups and having a glass transition
point of at least 20.degree. C. monomer (b): a monomer having no R.sup.f
group and having a cross-linkable functional group.