To provide a berth containing a chair seat for the large room type second-class cabin of a long distance sea route in which a passenger sees a good view, a comfortable nature is not barred, and furthermore an individual nature is assured.

The berth containing the chair seat, which has a berth surface integrally composed of a berth surface one end part, a berth surface intermediate part, and a berth surface other end part, includes: a hinge 5, which is attached to the other end of the berth surface one end part 1 and supports one end of the berth surface intermediate part 2; a bracket 6, which is attached to one end of the berth surface other end part 3 and supports the other end of the berth surface intermediate part 2; a notch 8 for a chair seat entrance and exit, which is cut and opened in the berth surface intermediate part 2 one side position of a seat table height enclosure plate 7 which encloses the top of the berth surface 4; and an engaging apical plate 9, which is slidably built over a pair of the right and left upper ends of the seat table height enclosure plate 7.