A method for producing a (meth)acrylic resin composition, the method comprising the steps of: continuously feeding methyl methacrylate, a chain transfer agent, and a radical polymerization initiator into a tank reactor while controlling each amount of the methyl methacrylate, the chain transfer agent, and the radical polymerization initiator, performing bulk polymerization in the tank reactor at a polymerization conversion of 40 to 70% by mass to obtain a reaction product, recovering a mixture containing methyl methacrylate and a chain transfer agent from the reaction product, and continuously feeding the mixture into the tank reactor, wherein each of the amounts of the methyl methacrylate and the chain transfer agent being fed into the tank reactor is controlled on the basis of information comprising an amount of the mixture being fed into the tank reactor and proportions of the methyl methacrylate and the chain transfer agent in the mixture, and a perfect-mixing time of the tank reactor (θ M [hr]), a half life of the radical polymerization initiator at a temperature equal to a temperature inside the tank reactor (τ 1/2 [hr]), a agitation power of the tank reactor (Pv [kW/m 3]), a mean residence time of a reaction starting material in the tank reactor (θ [hr]), and a concentration of the radical polymerization initiator in the reaction starting material (I [ppm]) satisfy: θ M > τ 1 / 2, and P V × θ × I × τ 1 / 2 < 4 kW × hr 2 / m 3; and when the target total amount of the methyl methacrylate being fed into the tank reactor is set as M Tmma [kg/hr], the amount of the methyl methacrylate being fed, expressed as M vmma [kg/hr], is determined by a math formula: M Tmma - 0.01.X Imma × M vinit - 0.01X mma × M c, in which X mma [% by mass] is the proportion of the methyl methacrylate in the mixture, M c [kg/hr] is the amount of the mixture being fed, M vinit [kg/hr] is the amount of the solution of the radical polymerization initiator in methyl methacrylate being fed into the tank reactor and X Imma [% by mass] is the proportion of the methyl methacrylate (1") in the solution of the radical polymerization initiator in methyl methacrylate. continuously feeding methyl methacrylate, a chain transfer agent, and a radical polymerization initiator into a tank reactor while controlling each amount of the methyl methacrylate, the chain transfer agent, and the radical polymerization initiator, performing bulk polymerization in the tank reactor at a polymerization conversion of 40 to 70% by mass to obtain a reaction product, recovering a mixture containing methyl methacrylate and a chain transfer agent from the reaction product, and continuously feeding the mixture into the tank reactor, wherein each of the amounts of the methyl methacrylate and the chain transfer agent being fed into the tank reactor is controlled on the basis of information comprising an amount of the mixture being fed into the tank reactor and proportions of the methyl methacrylate and the chain transfer agent in the mixture, and a perfect-mixing time of the tank reactor (θ M [hr]), a half life of the radical polymerization initiator at a temperature equal to a temperature inside the tank reactor (τ 1/2 [hr]), a agitation power of the tank reactor (Pv [kW/m 3]), a mean residence time of a reaction starting material in the tank reactor (θ [hr]), and a concentration of the radical polymerization initiator in the reaction starting material (I [ppm]) satisfy: θ M > τ 1 / 2, and P V × θ × I × τ 1 / 2 < 4 kW × hr 2 / m 3; and when the target total amount of the methyl methacrylate being fed into the tank reactor is set as M Tmma [kg/hr], the amount of the methyl methacrylate being fed, expressed as M vmma [kg/hr], is determined by a math formula: M Tmma - 0.01.X Imma × M vinit - 0.01X mma × M c, in which X mma [% by mass] is the proportion of the methyl methacrylate in the mixture, M c [kg/hr] is the amount of the mixture being fed, M vinit [kg/hr] is the amount of the solution of the radical polymerization initiator in methyl methacrylate being fed into the tank reactor and X Imma [% by mass] is the proportion of the methyl methacrylate (1") in the solution of the radical polymerization initiator in methyl methacrylate.