A holding device for cards and/or bank notes, contains an upwardly open housing including a bottom, the bottom including upwardly projecting side strips arranged at a distance from each other. All types of cards and/or bank notes can be received in the holding device in a permanently reliable manner and such that the material thereof is protected as far as possible. To this end, the side strips together with the bottom form a slide-in compartment that has a slide-in width along a defined grip length, at least in sections, which is larger than 52 mm and smaller than 53.98 mm.