Provided are a helically traveling carriage and a helically traveling cleaning machine capable of efficiently performing a maintenance process, such as cleaning, with respect to a helical structure formed by winding a helical wall around a column at a central section of a vertically extending cylindrical wall. This helically traveling carriage comprises: a lower moving-and-contacting part that rolls or slides on an upper surface of a helical wall; a lateral bridge mechanism that bridges an outer circumferential surface of a column and an inner circumferential surface of a cylindrical wall, the lateral bridge mechanism having, on one end thereof, a first moving-and-contacting part that rolls or slides on the inner circumferential surface of the cylindrical wall, and having, on the other end, a second moving-and-contacting part that rolls or slides on the outer circumferential surface of the column; and a rotary engagement part that rotatably engages with the column by laterally receiving a portion of the column.
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