A passenger seat unit comprises modular designed elements, such as at least one seat, and shield elements in the head and foot region. The shield elements are formed by seat dividers that are arranged opposite each other, which seat dividers comprise laterally arranged limbs of the partition wall. One side of the limbs of the partition wall encloses a wall element and forms a closed longitudinal side. The other side of the limbs of the partition wall forms a second longitudinal side which frames an access opening. The longitudinal sides comprise means for length adjustment.It is particularly advantageous if the passenger seat unit according to the invention makes possible more flexible and more economical use of the existing cabin area in passenger aircraft. Flexible adaptation to various cabin lengths is possible without effort.