PURPOSE: To simply and inexpensively produce a deep-draw product having marblelike appearance.

CONSTITUTION: 20-200 pts.wt. of an inorg. filler and a polymerization initiator are kneaded with 100 pts.wt. of an acrylic resin syrup and the resulting kneaded mixture is polymerized to prepare a thermoplastic resin with a wt. average mol.wt. of 200000-1500000. This resin is molded into a thermoplastic resin plate with a thickness of 1-15mm and this plate is subjected to vacuum and/or pressure forming to produce a molded product having marblelike appearance.