To provide a bed used also as a seat capable of allowing a passenger to obtain an excellent view, the minimum privacy, comfortableness in sitting, and the good management of personal belongings, etc.

The bed is constituted by the cooperation of one end of the bed for supporting the upper part of a human body, the middle part of the bed for supporting the middle part of the human body, and the other end of the bed for supporting the lower part of the human body. The bed includes: hinges attached to one end of the other end of the bed so as to support the other end of the middle part of the bed; receiving metal piece attached to the other end of one end of the bed so as to support one end of the middle part of the bed; and half-height partitions arranged on the whole circumference of the bed excluding the passage side of the middle part of the bed.