A slurry composition for a non-aqueous secondary battery positive electrode comprising a positive electrode active material and a copolymer, wherein
- a proportion constituted by nickel among transition metal in the positive electrode active material is at least 30.0 mol % and not more than 100.0 mol %, and
- the copolymer includes a nitrile group-containing monomer unit and a basic group-containing monomer unit, percentage content of the nitrile group-containing monomer unit in the copolymer is at least 70.0 mass % and not more than 96.0 mass %, and percentage content of the basic group-containing monomer unit in the copolymer is at least 0.1 mass % and not more than 5.0 mass %.