Problem to be solved. To provide a bivalve shell removal unit capable of automatically performing shell opening and removal of shell of a bivalve at high speed with a simple structure, without reducing freshness and quality of a shelled shellfish. Solution. A shell removal unit S1 of an oyster 1 comprises: a turn table 2 intermittently rotating; and a treatment station 3 being provided in the surrounding of the turn table 2 and performing prescribed treatment, processing, or transfer for the oyster 1. The treatment station 3 comprises: a putting unit 5 for sequentially putting the oysters 1 into a table jig 4; a shell cutting unit 6 for cutting ends of first and second shells at a prescribed part of the oyster 1; a positioning unit 7 for positioning a cut opening of the oyster 1 to a prescribed height position; a first adductor muscle cutting unit 8 for...

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