A composite magnetic tape which can be readily applied to electronic equipment regardless on the inside and outside of the equipment and can prevent the radiation and reflection of unnecessary electromagnetic waves from and to the inside of the equipment and, at the same time, can intercept electromagnetic noise from the outside. The tape can be formed in the form of an adhesive tape or autoadhesive tape. The tape is constituted of a composite magnetic layer formed by scattering soft magnetic power in an organic binder or in a laminated constitution of the composite magnetic layer and a conductive layer.