[Problem] To provide an axial flow exhaust turbine which enables smooth discharge from a steam path to a drain, reduces the cost of part replacement, and saves space. [Solution] The axial flow exhaust turbine (1) includes: a steam passage (6) in which steam passage rotator blades (12) and stator blades (14) have been arranged; an exhaust chamber (8) provided downstream from the steam passage (6) for discharging steam from the steam passage (6) in the axial direction of the turbine; a drive chamber (10) including the steam passage (6) and the steam chamber (8); and an interior barrier (30) provided on the inner periphery of the drive chamber (10) facing the steam chamber (8). A drain passage (34) is formed between the drive chamber (10) and the interior barrier (30) through which drainage recovered from the steam passage (6) is able to pass.
