PROBLEM TO BE SOLVED: To provide a paddy field ditcher which facilitates movement and a turnabout, and which enables a ditching blade to be easily returned to a use position.SOLUTION: A paddy field ditcher 1 includes: a drive wheel 4 that is rotatively driven a support frame 16 that is extended posterior to the drive wheel 4 a ditching blade 10 that is attached in such a manner as to be capable of rotating on a rotating shaft 16a with respect to the support frame 16 and extended posterior to the rotating shaft 16a and a stop mechanism 21 that stops rotation of the ditching blade 10 when the ditching blade 10 is rotated by a predetermined angle B2 downward from a use position.SELECTED DRAWING: Figure 3