PROBLEM TO BE SOLVED: To provide a distribution ball inner sheet surface process machine for processing a distribution ball inner sheet surface thereby to improve the efficiency and preciseness of the process.SOLUTION: A distribution ball inner sheet surface process machine comprises: a ring-shaped stationary portion 21 to be mounted along the circumference of a manhole 102 at the sheet surface processing time of a distribution ball 101; and a blade 321 mounted on a cutter holder 32 toward a distribution ball body side sheet surface 103 of the manhole 102; and a blade 73 mounted on the cutter holder toward a manhole cover sheet surface 202 at the manhole cover sheet surface processing time.
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