A resin composition comprising an acrylic resin and a graft copolymer, wherein the graft copolymer comprises the following inner layer and outer layer: inner layer: a soft polymer having, as structural units, a monomer mixture (b) comprising 40 to 99 wt% of an alkyl acrylate ester, 1 to 60 wt% of benzyl (meth)acrylate, and 0 to 40 wt% of another monomer having a double bond and copolymerizable with the alkyl acrylate ester and the benzyl (meth)acrylate and 0.1 to 5 parts by weight of a polyfunctional monomer (per 100 parts by weight of a total amount of the monomer mixture (b)); and outer layer: a hard polymer having, as structural units, a monomer mixture (c) comprising 60 to 100 wt% of an alkyl methacrylate ester, 0 to 10 wt% of benzyl (meth)acrylate, and 40 to 0 wt% of another monomer having a double bond and copolymerizable with the alkyl methacrylate ester and the benzyl (meth)acrylate and 0 to 10 parts by weight of a polyfunctional monomer (per 100 parts by weight of a total amount of the monomer mixture (c)), wherein the graft copolymer further comprises the following innermost layer: innermost layer: a hard polymer having, as structural units, a monomer mixture (a) comprising 60 to 99 wt% of an alkyl methacrylate ester, 1 to 40 wt% of benzyl (meth)acrylate, 0 to 35 wt% of an alkyl acrylate ester, and 0 to 15 wt% of another monomer having a double bond and copolymerizable with the benzyl (meth)acrylate, the alkyl methacrylate ester and the alkyl acrylate ester and 0.01 to 10 parts by weight of a polyfunctional monomer (per 100 parts by weight of a total amount of the monomer mixture (a)), and wherein the term "soft" means that the glass transition temperature of the polymer is lower than 20°C, the term "hard" means that the glass transition temperature of the polymer is 20°C or higher, the term "polyfunctional monomer" relates to a cross-linking agent or a cross-linkable monomer, and wherein the glass transition temperature is determined as defined in the specification. inner layer: a soft polymer having, as structural units, a monomer mixture (b) comprising 40 to 99 wt% of an alkyl acrylate ester, 1 to 60 wt% of benzyl (meth)acrylate, and 0 to 40 wt% of another monomer having a double bond and copolymerizable with the alkyl acrylate ester and the benzyl (meth)acrylate and 0.1 to 5 parts by weight of a polyfunctional monomer (per 100 parts by weight of a total amount of the monomer mixture (b)); and outer layer: a hard polymer having, as structural units, a monomer mixture (c) comprising 60 to 100 wt% of an alkyl methacrylate ester, 0 to 10 wt% of benzyl (meth)acrylate, and 40 to 0 wt% of another monomer having a double bond and copolymerizable with the alkyl methacrylate ester and the benzyl (meth)acrylate and 0 to 10 parts by weight of a polyfunctional monomer (per 100 parts by weight of a total amount of the monomer mixture (c)), wherein the graft copolymer further comprises the following innermost layer: innermost layer: a hard polymer having, as structural units, a monomer mixture (a) comprising 60 to 99 wt% of an alkyl methacrylate ester, 1 to 40 wt% of benzyl (meth)acrylate, 0 to 35 wt% of an alkyl acrylate ester, and 0 to 15 wt% of another monomer having a double bond and copolymerizable with the benzyl (meth)acrylate, the alkyl methacrylate ester and the alkyl acrylate ester and 0.01 to 10 parts by weight of a polyfunctional monomer (per 100 parts by weight of a total amount of the monomer mixture (a)), and wherein the term "soft" means that the glass transition temperature of the polymer is lower than 20°C, the term "hard" means that the glass transition temperature of the polymer is 20°C or higher, the term "polyfunctional monomer" relates to a cross-linking agent or a cross-linkable monomer, and wherein the glass transition temperature is determined as defined in the specification. innermost layer: a hard polymer having, as structural units, a monomer mixture (a) comprising 60 to 99 wt% of an alkyl methacrylate ester, 1 to 40 wt% of benzyl (meth)acrylate, 0 to 35 wt% of an alkyl acrylate ester, and 0 to 15 wt% of another monomer having a double bond and copolymerizable with the benzyl (meth)acrylate, the alkyl methacrylate ester and the alkyl acrylate ester and 0.01 to 10 parts by weight of a polyfunctional monomer (per 100 parts by weight of a total amount of the monomer mixture (a)), and wherein the term "soft" means that the glass transition temperature of the polymer is lower than 20°C, the term "hard" means that the glass transition temperature of the polymer is 20°C or higher, the term "polyfunctional monomer" relates to a cross-linking agent or a cross-linkable monomer, and wherein the glass transition temperature is determined as defined in the specification.