PROBLEM TO BE SOLVED: To provide a rotary operating machine capable of positively removing sediment deposited on an apron member.SOLUTION: An apron member 1 includes an apron body part 3 and a first apron cover member 21d joined to the apron body part 3 at a first apron joining means 221d. A fourth free end portion 121d on the side of the first apron cover member 21d opposite to the first apron joining means 221d is positioned within a rotary space S of an operating rotor 5 when the apron body part 3 and the first apron cover member 21a are rotated relative to a shield cover body part 2 and moved to an upward position.