To provide a shelf opening device which can automatically open a folded shelf (returns a folded state to an initial state (shelf state)).SOLUTION: A shelf opening device 1 includes: a shelf opening unit 14 vertically movable on a back face side of a frame body; a shelf opening unit driving part 13; an inclination formation part 15 provided on the shelf opening unit 14; a first preliminary opening part 17 which is inserted to a gap of an inward-folded part so that an open state of an acute angle formed in the inward-folded part of the folded shelf in an inclined state or a cantilever state in the inclination formation part 15 becomes larger; a second preliminary opening part 27 inserted to a position in contact with a bottom surface (front shelf plate part 322f) on a front side while sandwiching a hinge of the folded shelf; and an extrusion...

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