A contactless adapter comprising: a secondary coil that is arranged on a substrate (61, 75, 42, 43) and configured to generate an induced electromotive force; a power supply circuit unit that is configured to convert the induced electromotive force generated at the secondary coil to a predetermined output voltage; a plug unit including an output terminal and serving as an output unit configured to be able to be electrically connected or magnetically coupled to an electrical appliance (20, 85 to supply the output voltage converted by the power supply circuit unit to the electrical appliance (20, 85); wherein the contactless adapter is configured to be attached to the electrical appliance (20, 85) so that the contactless adapter can be carried integrally with the electrical appliance (20, 85); a connection line that is configured to connect the power supply circuit unit and the output unit; a housing of the power supply circuit unit, wherein a portion of the substrate (61, 75, 42, 43) is coupled to the housing; characterized by a telescopic arm configured to serve as a coupling body that couples the housing of the power supply circuit unit and the output unit so that a distance and an angle are variable, wherein the connection line is arranged along the coupling body; wherein the substrate (61, 75, 42, 43) is a substrate that is rollable into and spreadable from a cylindrical form or a substrate that is foldable and spreadable; the output unit of the contactless adapter is configured to be attached in a removable manner to the electrical appliance (20, 85); and when the output unit is attached to the electrical appliance (20, 85), the contactless adapter is pivotally supported by the electrical appliance (20, 85). a secondary coil that is arranged on a substrate (61, 75, 42, 43) and configured to generate an induced electromotive force; a power supply circuit unit that is configured to convert the induced electromotive force generated at the secondary coil to a predetermined output voltage; a plug unit including an output terminal and serving as an output unit configured to be able to be electrically connected or magnetically coupled to an electrical appliance (20, 85 to supply the output voltage converted by the power supply circuit unit to the electrical appliance (20, 85); wherein the contactless adapter is configured to be attached to the electrical appliance (20, 85) so that the contactless adapter can be carried integrally with the electrical appliance (20, 85); a connection line that is configured to connect the power supply circuit unit and the output unit; a housing of the power supply circuit unit, wherein a portion of the substrate (61, 75, 42, 43) is coupled to the housing; characterized by a telescopic arm configured to serve as a coupling body that couples the housing of the power supply circuit unit and the output unit so that a distance and an angle are variable, wherein the connection line is arranged along the coupling body; wherein the substrate (61, 75, 42, 43) is a substrate that is rollable into and spreadable from a cylindrical form or a substrate that is foldable and spreadable; the output unit of the contactless adapter is configured to be attached in a removable manner to the electrical appliance (20, 85); and when the output unit is attached to the electrical appliance (20, 85), the contactless adapter is pivotally supported by the electrical appliance (20, 85).