Abstract: A noise reduction tool includes a magnetic body that can be wound around, more than one turn around an axis of an electric wire or an electric wire bundle, the electric wire or the electric wire bundle and a fixing member that fixes, to each other, overlapping sections of a stacked portion in the magnetic body having a winding shape wound around the electric wire or the electric wire bundle and fixes the magnetic body to the electric wire or the electric wire bundle while keeping the winding shape of the magnetic body. The magnetic body is capable of changing a winding diameter according to an electric wire diameter of the electric wire or an electric wire bundle diameter of the electric wire bundle, and the fixing member fixes, to each other, the overlapping sections corresponding to a winding diameter of the magnetic body irrespective of the winding diameter.

Abstract: A noise reduction tool includes a sheet-like or belt-like magnetic body that can be wound. In the magnetic body, electric wires, axial directions of which are aligned with a winding axis direction of a winding shape, are disposed side by side around an axis of a winding axis on one plane disposed on the inner side in the winding shape. For example, in the magnetic body, an adhesive to be bonded to the other plane is provided on one plane of an end portion located on the outermost side of both end portions extending along the winding axis direction in the winding shape.

Abstract: A prepreg comprising an epoxy resin (A), a boron chloride-amine complex (B) and a fiber base material (C) is used. Preferably, the molar ratio of boron in the boron chloride-amine complex (B) is 4-7 mol % with respect to the number of moles of epoxy groups in the epoxy resin (A), and the epoxy resin (A) includes a bifunctional epoxy resin with an oxazolidone ring structure, a bisphenol-type epoxy resin and a phenol-novolac-type epoxy resin.

Abstract: A prepreg comprising an epoxy resin (A), a boron chloride-amine complex (B) and a fiber base material (C) is used. Preferably, the molar ratio of boron in the boron chloride-amine complex (B) is 4-7 mol % with respect to the number of moles of epoxy groups in the epoxy resin (A), and the epoxy resin (A) includes a bifunctional epoxy resin with an oxazolidone ring structure, a bisphenol-type epoxy resin and a phenol-novolac-type epoxy resin.

Abstract: A prepreg comprising an epoxy resin (A), a boron chloride-amine complex (B) and a fiber base material (C) is used. Preferably, the molar ratio of boron in the boron chloride-amine complex (B) is 4-7 mol % with respect to the number of moles of epoxy groups in the epoxy resin (A), and the epoxy resin (A) includes a bifunctional epoxy resin with an oxazolidone ring structure, a bisphenol-type epoxy resin and a phenol-novolac-type epoxy resin.