A yarn accumulating device comprising: a yarn accumulating roller around which a yarn is wound; a yarn guiding member rotatable with respect to the yarn accumulating roller; a first driving section adapted to rotatably drive the yarn accumulating roller; and a second driving section adapted to rotatably drive the yarn guiding member, wherein the yarn accumulating roller includes a yarn accumulating section around which the yarn is wound, and a supporting section arranged on an inner side of the yarn accumulating section, the first driving section includes a first stator located on the inner side of the yarn accumulating section and arranged so as to extend along a rotation axis direction of the yarn accumulating roller and to be coaxial with a rotation axis, and a first rotor fixed on the inner side of the yarn accumulating section at a position surrounding the first stator, characterized in that the second driving section includes a second stator located on the inner side of the yarn accumulating section and fixed to a distal end of the first stator, and a second rotor fixed to the yarn guiding member, the supporting section surrounds the distal end of the first stator and is arranged between the first rotor and the second stator, and is supported by the first stator, and at least two bearing members (55, 56) that enable the yarn accumulating roller to freely rotate with respect to the first stator are arranged between the first stator and the supporting section. a yarn accumulating roller around which a yarn is wound; a yarn guiding member rotatable with respect to the yarn accumulating roller; a first driving section adapted to rotatably drive the yarn accumulating roller; and a second driving section adapted to rotatably drive the yarn guiding member, wherein the yarn accumulating roller includes a yarn accumulating section around which the yarn is wound, and a supporting section arranged on an inner side of the yarn accumulating section, a yarn accumulating section around which the yarn is wound, and a supporting section arranged on an inner side of the yarn accumulating section, the first driving section includes a first stator located on the inner side of the yarn accumulating section and arranged so as to extend along a rotation axis direction of the yarn accumulating roller and to be coaxial with a rotation axis, and a first rotor fixed on the inner side of the yarn accumulating section at a position surrounding the first stator, characterized in that a first stator located on the inner side of the yarn accumulating section and arranged so as to extend along a rotation axis direction of the yarn accumulating roller and to be coaxial with a rotation axis, and a first rotor fixed on the inner side of the yarn accumulating section at a position surrounding the first stator, characterized in that the second driving section includes a second stator located on the inner side of the yarn accumulating section and fixed to a distal end of the first stator, and a second rotor fixed to the yarn guiding member, a second stator located on the inner side of the yarn accumulating section and fixed to a distal end of the first stator, and a second rotor fixed to the yarn guiding member, the supporting section surrounds the distal end of the first stator and is arranged between the first rotor and the second stator, and is supported by the first stator, and at least two bearing members (55, 56) that enable the yarn accumulating roller to freely rotate with respect to the first stator are arranged between the first stator and the supporting section.