The present invention relates to a panel-shaped molded product having a laminated structure which is produced from a resin and used for side doors, back doors, hoods, roofs, etc., and exhibits a more excellent finishing accuracy without occurrence of bleed-out along an inner periphery of a frame part and fine distortions on a design part. The panel-shaped molded product of the present invention is a molded product having a laminated structure which is obtained by injection-molding the frame part (2) on one surface of the plate-shaped design part (1) wherein an inner peripheral portion (4) of the frame part (2) is closely attached to the design part, and has a thickness changing region where a thickness of the frame part is reduced toward the side of a center of the frame part such that a ratio between a width of the thickness changing region and the thickness of the frame part (2), and a ratio between a width of the thickness changing region and a width of the frame part (2) are respectively adjusted to satisfy specific relationships.