Method for producing multilayer film

A method for producing a multilayer film, comprising:

• (A) a step for continuously coextruding, from a T die, a molten film of a multilayer film in which a first acrylic resin layer (α1), an aromatic polycarbonate resin layer (β), and a second acrylic resin layer (α2) are directly laminated in the stated order by using a coextrusion apparatus provided with an extruder and the T die;
• (B) a step for feeding and pressing the molten film of the multilayer film between a first mirror-finished body that rotates or circulates and a second mirror-finished body that rotates or circulates so that the first acrylic resin layer (α1) is disposed on the first-mirror-finished-body side;
• and
• (C) a step for holding the multilayer film pressed in the step (B) against the first mirror-finished body and sending the pressed multilayer film to a subsequent third mirror-finished body that rotates or circulates,
• wherein the following formulae (1) to (3) are satisfied:
• (Tα1−15)≤TR1≤(Tα1+10) (1)
• (Tα2−25)≤TR2<(Tα2+5) (2)
• (Tβ−20)≤TR1 (3)
• wherein TR1 is a surface temperature of the first mirror-finished body, TR2 is a surface temperature of the second mirror-finished body, Tα1 is a glass transition temperature of an acrylic resin constituting the first acrylic resin layer (α1), Tα2 is a glass transition temperature of an acrylic resin constituting the second acrylic resin layer (α2), Tβ is a glass transition temperature of an aromatic polycarbonate resin constituting the aromatic polycarbonate resin layer (β), and all temperature units are ° C.