This invention provides an antifouling detergent for hard surfaces, which
is excellent in antifouling effect without any problem in corrosion of
metallic materials. The antifouling detergent for hard surfaces comprises
a polymer comprising a monomer unit A having at least one group selected
from amino groups and quaternary ammonium groups and a monomer unit B
represented by --SO.sub.2--, in a specific ratio in the molecule.