PROBLEM TO BE SOLVED: To close a notch part 6b for penetrating a seat plate 12 in a state where a blocking-up body 13 for sliding a guide rail 5 does not bite in the seat plate, in a fireproof shutter device for hanging down the guide rail 5 of a storage attitude by interlocking with descent of a shutter curtain 1.SOLUTION: A material for blocking up a both part 6b is formed as a movable piece 14d for rocking in an opening position for abutting on both end surface parts 12d in the seat plate longitudinal direction from a position for blocking up the notch part 6b, and the movable piece 14d is expansively opened-rocked in the opening position by receiving sliding resistance when abutting on both end surface parts 12d in the longitudinal direction when the movable piece 14d moves downward together with the seat plate, and the downward movement of the blocking-up body 13 is stopped by allowing the movable piece 14 to abut on a step difference projection part 6c provided in the notch part 6b, and abutment on both end surface parts 12d in the longitudinal direction is released, and the movable piece 14d changes an attitude to a blocking-up position thereby, and the blocking-up body 13 moves downward by releasing the abutment on both end surface parts 12d in the longitudinal direction of the movable body 14d together.
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