A dope for producing a film by a solution casting method, the dope comprising: a thermoplastic acrylic-based resin; a graft copolymer; and a solvent, wherein the graft copolymer has a core layer and a shell layer, the core layer has an average particle diameter of 125 to 400 nm, determined in a state of a polymer latex of the core layer before polymerization of a shell layer by measuring light scattering at a wavelength of 546 nm using a spectrophotometer, the graft copolymer has a degree of swelling by methyl ethyl ketone, measured as disclosed in the description, of 3.5 or more, the graft copolymer has a gel fraction of 90% or less, the gel fraction being a weight ratio of a component insoluble in methyl ethyl ketone of the graft copolymer to the total amount of the graft copolymer measured as disclosed in the description, the core layer has a polymer terminal structure composed of an alkylthio group, the core layer has a hard polymer containing, as structural units, 40 to 100% by weight of a methacrylic ester unit (a-1), 60 to 0% by weight of another monomer unit (a-2) having a double bond copolymerizable with the methacrylic ester unit, and 0.01 to 10 parts by weight of a polyfunctional monomer unit per 100 parts by weight of a total amount of the (a-1) and the (a-2), and a soft polymer containing, as structural units, 60 to 100% by weight of an acrylic ester unit (b-1), 0 to 40% by weight of another monomer unit (b-2) having a double bond copolymerizable with the acrylic ester unit, and 0.1 to 5 parts by weight of a polyfunctional monomer unit per 100 parts by weight of a total amount of the (b-1) and the (b-2), the soft polymer is bonded to the hard polymer, the shell layer includes a hard polymer containing, as structural units, 60 to 90% by weight of a methacrylic ester unit (c-1), 40 to 10% by weight of an acrylic ester unit (c-2), and 0 to 10 parts by weight of a polyfunctional monomer unit per 100 parts by weight of a total amount of the (c-1) and the (c-2), and the hard polymer is graft-bonded to the hard polymer and/or the soft polymer, and the solvent has a hydrogen bonding term 6H in a Hansen solubility parameter of 6.0 or more and 8.0 or less. a thermoplastic acrylic-based resin; a graft copolymer; and a solvent, wherein the graft copolymer has a core layer and a shell layer, the core layer has an average particle diameter of 125 to 400 nm, determined in a state of a polymer latex of the core layer before polymerization of a shell layer by measuring light scattering at a wavelength of 546 nm using a spectrophotometer, the graft copolymer has a degree of swelling by methyl ethyl ketone, measured as disclosed in the description, of 3.5 or more, the graft copolymer has a gel fraction of 90% or less, the gel fraction being a weight ratio of a component insoluble in methyl ethyl ketone of the graft copolymer to the total amount of the graft copolymer measured as disclosed in the description, the core layer has a polymer terminal structure composed of an alkylthio group, the core layer has a hard polymer containing, as structural units, 40 to 100% by weight of a methacrylic ester unit (a-1), 60 to 0% by weight of another monomer unit (a-2) having a double bond copolymerizable with the methacrylic ester unit, and 0.01 to 10 parts by weight of a polyfunctional monomer unit per 100 parts by weight of a total amount of the (a-1) and the (a-2), and a soft polymer containing, as structural units, 60 to 100% by weight of an acrylic ester unit (b-1), 0 to 40% by weight of another monomer unit (b-2) having a double bond copolymerizable with the acrylic ester unit, and 0.1 to 5 parts by weight of a polyfunctional monomer unit per 100 parts by weight of a total amount of the (b-1) and the (b-2), the soft polymer is bonded to the hard polymer, the shell layer includes a hard polymer containing, as structural units, 60 to 90% by weight of a methacrylic ester unit (c-1), 40 to 10% by weight of an acrylic ester unit (c-2), and 0 to 10 parts by weight of a polyfunctional monomer unit per 100 parts by weight of a total amount of the (c-1) and the (c-2), and the hard polymer is graft-bonded to the hard polymer and/or the soft polymer, and the solvent has a hydrogen bonding term 6H in a Hansen solubility parameter of 6.0 or more and 8.0 or less.