PURPOSE: To provide a universal foldable lamp shade overshade by forming a through-hole at an equal position from an upper margin in each panel of a pleated sheet and by attaching a drawstring movable in an in-and-out fashion through the holes.

CONSTITUTION: This overshade 10 is relatively rigid, and is machined from a pleated sheet 12 formed of a foldable ornamental material 12. The ornamental sheet 12 has rigidity capable of keeping a free erected shape and flexibility in an accordion fashion. Marginal panels 28 and 30 of the sheet 12 are overlapped and bonded together along a surface 32 so as to form a tubular member. A drawstring 14 formed of a thin, flexible cord material in a predetermined length is positioned movably in an in-and-out fashion through holes formed adjacently to the upper margin 24 of the sheet 12. Ends 20,22 of the string 14 are extracted from the adjacent holes at positions 16,18 so as to freely tie and combine them together after the periphery of the upper margin 24 is reduced in circumference. A lamp shade is substantially covered by constricting the string 14 so as to reduce its circumference at the upper end.