To provide an axial-flow turbine capable of easily obtaining a moving blade capable of reducing blade profile loss with a single material, and a low-pressure steam turbine using the axial-flow turbine.

The axial-flow turbine is provided with auxiliary moving blade rows 13, 13X having moving blades 14 having a shorter blade length and a thinner blade thickness compared to the moving blade 4 of the moving blade rows 5E downstream of the moving blade rows 5E positioned downstream of the working fluid among the moving blade rows 5, 5E provided in a multi-stage in the flowing direction of the working fluid (steam). The wall thickness having small acting centrifugal force and securing a shearing strength can be thinned by shortening the blade length 14. In the result, a flow resistance of the working fluid becomes small and the blade profile loss can be reduced. In addition, since the thickness of the moving blade can be thinned with a single material, the forming is easy.