PROBLEM TO BE SOLVED: To provide an apparatus for fitting a bottle opening fitting material for mushroom harvesting capable of reliably fitting the bottle opening fitting material for the mushroom harvesting by the bottle opening of a bottle for the mushroom harvesting. SOLUTION: The apparatus for fitting the bottle opening fitting material for mushroom harvesting including a conveyor device 30 and a bottle opening fitting material supply device 40 includes: a belt device 50 for preventing the bottle opening fitting material from floating, provided such that: the bottle opening fitting material 20 being temporarily fitted to the bottle opening 11 by the bottle opening fitting material supply device 40 is prevented from floating and moves with a bottle for mushroom harvesting 10 while being pressed by a belt surface from above; and a flat belt 51 circulates; and a striking device 60 for striking and fitting the bottle opening fitting material 20 held to be temporarily fitted to the bottle opening 11 from above. COPYRIGHT: (C)2012,JPO&INPIT