To provide a device capable of automatically removing a thin enclosed material from an opened envelope with one side opened.SOLUTION: Provided is an
enclosure removal device 1, 101 that removes an
enclosure from an opened envelope EV, which has a double flat plate shape and in which a part of an edge EP is an opening side EO opened linearly to form an opening port EOO, and a thin
enclosure PC is contained therein. The device includes: an envelope transport conveyor 10 having an annular envelope transport belt 11 which contacts a first main surface of the opened envelope with the opening side facing downward VDH and transports the envelope in an envelope transport direction EH; and a support member 21, 121 located below the envelope transport conveyor 10, which supports an enclosure partly exposed from within the opened envelope through the opening port from below, and has a shape in which a distance G between the support member 21, 121 and the envelope transport belt increases as the support member 21, 121 advances in the envelope transport direction, and the exposed portion PCE of the enclosure exposed from within the opened envelope becomes larger as the opened envelope advances in the envelope transport direction.SELECTED DRAWING: Figure 2