To efficiently obtain a beautifully finished fillet in processing asymmetric fish.SOLUTION: A fish processing apparatus has: a pair of upper and lower first rotary cutters 12, 14 provided in a displacing manner in the direction to come close or move away to/from each other; a pair of left and right upper side second rotary cutters 16, 18 and lower side second rotary cutters 20, 22 provided in the body frame in a displacing manner in the direction to come close or move away to/from each other in the downstream side from the first rotary cutters 12, 14; springs 160, 188 for biasing the pair of upper and lower first rotary cutters 12, 14 in the direction coming close to each other vertically; and springs 306, 342 for biasing the pair of left and right upper side second rotary cutters 16, 18 and the pair of left and right lower side...

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