Abstract: A passenger seat 100 for an aircraft, including a seat bottom frame 210, a backrest frame 220 and a headrest frame 230 that constitute a reclining assembly, which are supported by a spreader 170 and pipes 130 and 132 fastened to a floor by seat track fittings 110, the pipes 130 and 132 passing through left and right legs 120. A direct-acting-type damper 300 is attached to the backrest frame 230, and an extension member 400 is attached to the headrest frame 230, whereby a structural design is provided in which the reclining assembly, the direct-acting-type damper and the extension member can be easily replaced.