A compact current-measuring device including a first printed circuit assembly including a first current sensor positioned around a first aperture and a second aperture, and a second printed circuit assembly including a second current sensor positioned around a third aperture. The second sensor includes a second rectilinear winding portion positioned facing a first rectilinear winding portion of the first current sensor. The second aperture is positioned facing the third aperture. A unit for measuring the electric current flowing in current lines of an electrical installation, and a method for manufacturing a current-measuring device.