A portable holder for removable attachment to a shelf is proposed, the portable holder for supporting an electronic device (such as, for example, a tablet, cell phone, e-reader or the like). The portable holder comprises a central support member for supporting the electronic device, a device retaining element coupled to a lower edge of the central support member and an upper attachment means coupled to a top edge of the central support member. The upper end termination is used to removably attach the portable holder to a shelf, and the holder is particularly formed to allow for the viewing angle of the device to be modified, as desired by the user. In one arrangement, the holder can be rotated while attached to the shelf, so as to be located in a preferred direction for the user.