Soundproof wall and steam turbine

A soundproof wall disposed in an annular space on an outer peripheral side of a rotary shaft rotatable around an axis, the soundproof wall comprising:

• a frame disposed in the annular space;
• a sound absorbing material supported by the frame;
• and
• a movement restricting member that restricts movement of the sound absorbing material to an axial noise-source side which is a side of a noise-source, out of both sides in an axial direction in which the axis extends,
• wherein the frame includes
• a support plate part extending in a circumferential direction around the axis and spreading in a radial direction around the axis,
• an outer peripheral plate part extending from an outer end of the support plate part in the radial direction toward the axial noise-source side and extending in the circumferential direction, and
• an inner peripheral plate part extending from an inner end of the support plate part in the radial direction toward the axial noise-source side and extending in the circumferential direction,
• the sound absorbing material is accommodated in a sound absorbing material accommodating space partitioned by the support plate part, the outer peripheral plate part, and the inner peripheral plate part, and
• the movement restricting member includes a sound absorbing material pressing member that comes into contact with the sound absorbing material only at a position away from the outer peripheral plate part and the inner peripheral plate part such that the sound absorbing material pressing member has no direct connection with the outer peripheral plate part and the inner peripheral plate part, and the sound absorbing material pressing member is relatively immovable with respect to the support plate part in the axial direction.