The boarding device is started. According to an aspect of the present invention, there is provided a boarding device installed in a boarding room formed inside a hull and having an entrance at one side, the boarding device comprising: a reel rotatably coupled to a ceiling of the boarding chamber; A string ladder wound around the reel and having a pair of ropes and a plurality of first scaffolds coupled to the pair of ropes; And a platform coupled to a bottom of the boarding compartment, the platform comprising: a pair of first vertical posts coupled to a bottom of the boarding compartment; A pair of second vertical posts coupled to the bottom of the passenger compartment and spaced apart from each other by a distance less than the long side of the first footplate; A first vertical post hinged to one end of the second vertical post and a second end vertically detachably coupled to an upper end of the first vertical post, Guide bars; A locking portion for fixing and releasing the guide bar in an upright posture; And a second footrest detachably coupled to the pair of guide bars.
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