A packaging/displaying device includes a main blank foldable into a housing that has a bottom panel, two side panels extending upwardly from two opposite sides of the bottom panel, a back panel extending upwardly from the bottom panel and connected between the side panels, and a top panel connected to a top end of the back panel and extending above the bottom panel, said top, bottom and side panels cooperatively defining a housing space for an object, the top panel having a through hole extending through said top panel to retain a top end of an object. The housing is open at its front side to display the object.