Abstract: Storage device for sheets, which are intended to be exposed particularly microfilms, which device comprises a case in the form of a sleeve substantially rectangular in form and with an elongated substantially rectangular cross-section, in which case a space is provided and forms an elongated opening at one end of the sleeve, the space enclosing a number of envelopes and between the envelopes intersheets, the envelopes being slidable between a position substantially entirely within said space and protected by the sleeve and an outer position extending out through the opening and with the main part of the envelope outside the sleeve, in which outer position stopping means are provided to prevent the respective envelope to be entirely drawn out from the sleeve and removed from the same, the intersheets being fixed in the sleeve against sliding movement, the envelopes being made of transparent material and intended to store the sheets which have to be exposed in said outer position.