A resin laminate manufacturing method, comprising: a step of providing a pair of split mold blocks (32A, 32B) one of which has a cavity (116, 116A) provided with a plurality of protrusions each extending toward the other one, and preparing two molten thermoplastic resin sheets each having a thickness adjusted; a step of feeding the two molten thermoplastic resin sheets between the pair of split mold blocks (32A, 32B) with a predetermined gap left there between such that each thermoplastic resin sheet protrudes around annular pinch-off parts (118, 118A, 118B); a step of forming a hermetic space (84, 86) between one of the sheets and the cavity (116, 116A) of the one mold block (32A, 32B) opposed to an outer surface of the one sheet; a step of sucking air in the hermetic space (89, 86) from the one mold block side, pressing the outer surface of the one sheet against the cavity (116, 116A) of the one mold block (32A, 32B) to shape the one sheet, and elongating the one sheet so as to fit the one sheet to the protrusions for molding a plurality of cup-shaped portions on the one sheet; and a step of clamping the pair of mold blocks (32A, 32B), welding peripheral edges of the two molten thermoplastic resin sheets to each other, and welding the top of the one sheet corresponding to the tip end of the cup shaped portions to an inner surface of the other sheet, characterized in that the thickness of each of the molten thermoplastic resin sheets is adjusted independently of the other to have the thickness of the thermoplastic resin sheet serving as the back-side sheet thicker than the thickness of the thermoplastic resin sheet serving as the front-side sheet, wherein a resin laminate is manufactured through these steps; wherein a width of a first extrusion slit is set larger than a width of a second extrusion slit, and wherein when a slide back sheet and a front-side sheet are welded together to obtain the laminate by the clamping of the pair of mold blocks (32A, 32B) the thickness of the back side sheet and the thickness of the front side sheet are set to substantially equal to each other. a step of providing a pair of split mold blocks (32A, 32B) one of which has a cavity (116, 116A) provided with a plurality of protrusions each extending toward the other one, and preparing two molten thermoplastic resin sheets each having a thickness adjusted; a step of feeding the two molten thermoplastic resin sheets between the pair of split mold blocks (32A, 32B) with a predetermined gap left there between such that each thermoplastic resin sheet protrudes around annular pinch-off parts (118, 118A, 118B); a step of forming a hermetic space (84, 86) between one of the sheets and the cavity (116, 116A) of the one mold block (32A, 32B) opposed to an outer surface of the one sheet; a step of sucking air in the hermetic space (89, 86) from the one mold block side, pressing the outer surface of the one sheet against the cavity (116, 116A) of the one mold block (32A, 32B) to shape the one sheet, and elongating the one sheet so as to fit the one sheet to the protrusions for molding a plurality of cup-shaped portions on the one sheet; and a step of clamping the pair of mold blocks (32A, 32B), welding peripheral edges of the two molten thermoplastic resin sheets to each other, and welding the top of the one sheet corresponding to the tip end of the cup shaped portions to an inner surface of the other sheet,