A seat unit for an aircraft comprising: a first seat comprising a first backrest and a first seating portion in which said first backrest is pivotable with respect to the first seating portion and is capable of changing forms between a seat state in which passengers can sit and a bed state in which the first seating portion and the first backrest are flat; a second seat disposed adjacent to the first seat, the second seat comprising a second backrest and a second seating portion, in which the second backrest is pivotable with respect to the second seating portion and is capable of changing forms between a seat state in which passengers can sit and a bed state in which the second seating portion and the second backrest are flat; and an intermediate portion arranged between the first seat and the second seat, when the first seat and the second seat are in the bed state, the intermediate portion is adjacent to the first backrest and the second backrest while a height of an upper surface of the intermediate portion substantially coincides with a height of the first backrest and the second backrest, the intermediate portion includes a first pedestal having a triangular prism shape and being disposed on the first seat side and a second pedestal having a triangular prism shape and being disposed on the second seat side, as well as a rectangular parallelepiped support portion disposed between the first and second pedestals (15a, 15b) and a partition plate, supported by the support portion and vertically movable between a housed state, in which the partition plate is housed in the support portion of intermediate portion, and a raised state, and when in the housed state, an upper end of the partition plate substantially coincides with or is located at or below the upper surface of the support portion of the intermediate portion, and when in the raised state, the upper end of the partition plate can move to a position above eye level of a user seated on at least the first seating portion or the second seating portion in the seat state; and the height positions of upper surfaces of the first and second pedestals (15a, 15b) and the upper surface of the support portion substantially coincide so that the entire upper surface of the intermediate portion has a uniform height; and the pedestals (15a, 15b), and the support portion are covered with a material having cushion properties. a first seat comprising a first backrest and a first seating portion in which said first backrest is pivotable with respect to the first seating portion and is capable of changing forms between a seat state in which passengers can sit and a bed state in which the first seating portion and the first backrest are flat; a second seat disposed adjacent to the first seat, the second seat comprising a second backrest and a second seating portion, in which the second backrest is pivotable with respect to the second seating portion and is capable of changing forms between a seat state in which passengers can sit and a bed state in which the second seating portion and the second backrest are flat; and an intermediate portion arranged between the first seat and the second seat, when the first seat and the second seat are in the bed state, the intermediate portion is adjacent to the first backrest and the second backrest while a height of an upper surface of the intermediate portion substantially coincides with a height of the first backrest and the second backrest, the intermediate portion includes a first pedestal having a triangular prism shape and being disposed on the first seat side and a second pedestal having a triangular prism shape and being disposed on the second seat side, as well as a rectangular parallelepiped support portion disposed between the first and second pedestals (15a, 15b) and a partition plate, supported by the support portion and vertically movable between a housed state, in which the partition plate is housed in the support portion of intermediate portion, and a raised state, and when in the housed state, an upper end of the partition plate substantially coincides with or is located at or below the upper surface of the support portion of the intermediate portion, and when in the raised state, the upper end of the partition plate can move to a position above eye level of a user seated on at least the first seating portion or the second seating portion in the seat state; and the height positions of upper surfaces of the first and second pedestals (15a, 15b) and the upper surface of the support portion substantially coincide so that the entire upper surface of the intermediate portion has a uniform height; and the pedestals (15a, 15b), and the support portion are covered with a material having cushion properties.