A poster frame for a poster sign, which is made of a closed hollow profile 6 of aluminium in top, bottom and sides, is assembled at the corners by means of connecting pieces. To accommodate the hollow profiles 6 the back has an attached thin metal plate with a width a little larger than that of a hollow profile 6 to which metal plate a transparent plate 2 can be attached, which covers a poster by means of a strip of magnetic tape stuck along the outer edge. A hollow profile 6, preferably in the bottom of the frame, has a slot 8 at its top along the back edge. In this hollow profile there is inserted one or more springy elements 9 embodied with a projecting ridge 10, which can be accommodated in a groove 11 in a plane plate member 12 of a thickness approximately equal to the width of the slot 8, a width which is larger than the width of the hollow profile 6 and a length a little shorter than the free length of profile 6 between two connecting pieces. The plate 2 is attached to the plate member 12. Along the other edges the plate 2 is attached to the frame by means of magnetic tape. When a poster is to be exchanged, the plate 2 can be bent outwards at the upper edge of the plate member 12, and this prevents the plate 2 from being stolen.
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