PROBLEM TO BE SOLVED: To provide a device which also serves as a front facing seat backrest of a bunk bed in a bunk bed in a camper room. SOLUTION: A seat backrest 2 is lifted horizontally, connected to a bunk bed main body 1, and fixed by a movable rod 6, so that the length of the upper bunk bed is secured and the front facing seat is compatible. Further, a part of the seat is diverted to the pillow 3 on the upper part of the bunk bed, and a part of the seat is connected to the lower bed to secure the length of the lower bed. [Selection diagram] Fig. 6
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