Provided are: a fiber-body cutting device that cuts a fiber bundle, into which a plurality of fibers are bundled, in a direction perpendicular to the long direction of the fiber bundle, said fiber-body cutting device being capable of preventing cutting problems at the cutting plane and a hollow-fiber-bundle manufacturing device. A cutting device (300) provided with the following: a first holding member (321) that holds a fiber bundle (Bf) around the circumference thereof a second holding member (322) that holds the fiber bundle (Bf), around the circumference thereof, at a point near the first holding member (321) but at a separation therefrom in a long direction (W) and a rotating blade (331) that cuts the fiber bundle (Bf) between the first holding member (321) and the second holding member (322). A first holding pressure with which the first holding member (321) holds the fiber bundle (Bf) is greater than a second holding pressure with which the second holding member (322) holds the fiber bundle (Bf). A first holding surface area with which the first holding member (321) holds the fiber bundle (Bf) is larger than a second holding surface area with which the second holding member (322) holds the fiber bundle (Bf).La présente invention concerne : un dispositif de coupe de corps de fibres qui coupe un faisceau de fibres, dans lequel une pluralité de fibres sont liées, dans une direction perpendiculaire à la direction longitudinale du faisceau de fibres, ledit dispositif de coupe de corps de fibres étant capable de prévenir les problèmes de coupe au niveau du plan de coupe et un dispositif de fabrication de faisceau de fibres creuses. Un dispositif (300) selon linvention est pourvu des éléments suivants : un premier élément de maintien (321) qui maintient un faisceau de fibres (Bf) autour de la circonférence de celui-ci un deuxième élément de maintien (322) qui maintient le faisceau de fibres (Bf), autour de la circonférence de celui-ci, à un point proche du premier
