Abstract: A unitary poster assembly molded of flexible synthetic plastic material, the assembly including a rectangular backing plate whose dimensions are slightly smaller than those of the poster. The plate is bordered by an integrated frame formed of top, bottom and left and right side branches, the top branch being spaced from the upper edge of the plate to form an inlet gap. The inner walls of the branches, save for the top branch, are slotted to define a U-shaped socket for receiving the corresponding margins of a poster supported on the backing plate. To install a poster, the top branch is momentarily bent back to admit the lower end of the poster into the inlet gap and to permit insertion of the side margins thereof into the slots of the side branches, the poster then being pushed down until its bottom margin lies in the slot of the bottom branch, at which point the poster is properly mounted.