A method for producing a retardation film comprising steps of: co-extruding or simultaneously casting a thermoplastic resin A having a positive intrinsic birefringence and a deflection temperature under load (Ts A) and a thermoplastic resin B having a negative intrinsic birefringence and a deflection temperature under load (Ts B) to obtain a laminated film S 0 comprising a layer A 0 composed of the thermoplastic resin A and a layer B 0 composed of the thermoplastic resin B, in which an absolute value of difference between Ts A and Ts B is not less than 5°C and not more than 40°C, and uniaxially stretching the laminated film S 0 at a temperature of T1 or T2 to obtain a uniaxially stretched film S 1 comprising a layer A 1 derived from the layer A 0 and a layer B 1 derived from the layer B 0, and then, uniaxially stretching the uniaxially stretched film S 1 at a different temperature, either T1 or T2, from the temperature of the step of uniaxially stretching the laminated film S 0 in a direction perpendicular to the stretching direction in the step of uniaxially stretching the laminated film S 0, thereby obtaining the retardation film comprising a layer A 2 derived from the layer A 1 and a layer B 2 derived from the layer B 1, in which T1 is not less than Ts B +3°C and not more than Ts A +5°C and T2 is not more than Ts B +3°C when Ts A > Ts B; or T2 is not less than Ts A +3°C and not more than Ts B +5°C and T1 is not more than Ts A +3°C when Ts B > Ts A in which a molecular orientation axis in the layer A 2 and a molecular orientation axis in the layer B 2 are at an angle of 70 degrees to 110 degrees to one another. co-extruding or simultaneously casting a thermoplastic resin A having a positive intrinsic birefringence and a deflection temperature under load (Ts A) and a thermoplastic resin B having a negative intrinsic birefringence and a deflection temperature under load (Ts B) to obtain a laminated film S 0 comprising a layer A 0 composed of the thermoplastic resin A and a layer B 0 composed of the thermoplastic resin B, in which an absolute value of difference between Ts A and Ts B is not less than 5°C and not more than 40°C, and uniaxially stretching the laminated film S 0 at a temperature of T1 or T2 to obtain a uniaxially stretched film S 1 comprising a layer A 1 derived from the layer A 0 and a layer B 1 derived from the layer B 0, and then, uniaxially stretching the uniaxially stretched film S 1 at a different temperature, either T1 or T2, from the temperature of the step of uniaxially stretching the laminated film S 0 in a direction perpendicular to the stretching direction in the step of uniaxially stretching the laminated film S 0, thereby obtaining the retardation film comprising a layer A 2 derived from the layer A 1 and a layer B 2 derived from the layer B 1, in which T1 is not less than Ts B +3°C and not more than Ts A +5°C and T2 is not more than Ts B +3°C when Ts A > Ts B; or T2 is not less than Ts A +3°C and not more than Ts B +5°C and T1 is not more than Ts A +3°C when Ts B > Ts A in which a molecular orientation axis in the layer A 2 and a molecular orientation axis in the layer B 2 are at an angle of 70 degrees to 110 degrees to one another.