The present invention relates to a phase difference film laminate formed by stretching a film before being stretched which has a P1 layer comprising a resin (p1) containing a polyphenylene ether having a positive intrinsic birefringence value and a polystyrene-based polymer having a negative intrinsic birefringence value and a syndiotactic structure, and a P2 layer disposed so as to come into contact with the P1 layer and comprising a resin (p2) containing an acrylic resin or an aliphatic structure-containing polymer, wherein in resin (p1) the weight ratio of the content of the polyphenylene ether/the content of the polystyrene-based polymer is between 35/65 and 45/55. The present invention also relates to a method for producing said phase difference film laminate, and a method for producing a phase difference film using said phase difference film laminate.