| 摘要 |
PROBLEM TO BE SOLVED: To simply attach a ladder to and detach from a passenger seat 20 and make elevation to a bed 32 possible. SOLUTION: This ladder 40 is arranged in the lower region of an entrance and exit of the bed 32 inside the cab 100, and detachably attached to the passenger seat 20 equipped with a head rest 23. The ladder 40 has a frame body 42 and a stem member 44. The frame body 42 has a pair of side supports, an upper lateral support 42b, and a lower lateral support 42c. The step member 44 is supported with the side supports. The upper lateral support 42b of the frame body 42 is positioned in the rear of the head rest 23, the side supports 42a are positioned in the front of back rest part 22 of the passenger seat 20, the lower lateral support 42c is placed on the seat surface 21a of the passenger seat 20, and thereby, the ladder is attached to and detached from the passenger seat 20.
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