Method for manufacturing a chip card, comprising: - producing an antenna for electromagnetic coupling with a contactless card-reader device, the antenna having at least two ends (216, 218), - laminating at least two layers of plastic, between which layers the antenna is positioned, - introducing, into a cavity formed in at least one layer of plastic, a chip card module including a substrate having a first main face and a second main face, with conductive tracks (414, 416) at least on the first main face of the substrate, this first face of the substrate having at least one conductive track set apart for a temporary electrical connection with a contact card-reader device, characterized in that it furthermore includes - providing a connection unit having a flexible film comprising a substrate, called substrate of the connection unit, and a conductive layer, said substrate of the connection unit having a first main face and a second main face, the conductive layer being colaminated on one of these main faces, this conductive layer including at least one connection pad having a first portion and a second portion that are connected electrically to one another, the connection unit including a solder material deposited at least on the second portion, over a thickness of between 0.02 and 0.5 mm, before being laminated between the layers of plastic, - connecting one of the ends of the antenna to the first portion of the conductive layer of the connection pad, and - connecting one of the conductive tracks (415, 416) of the module to the second portion of the conductive layer of the connection pad, this second portion having a plurality of perforations. - producing an antenna for electromagnetic coupling with a contactless card-reader device, the antenna having at least two ends (216, 218), - laminating at least two layers of plastic, between which layers the antenna is positioned, - introducing, into a cavity formed in at least one layer of plastic, a chip card module including a substrate having a first main face and a second main face, with conductive tracks (414, 416) at least on the first main face of the substrate, this first face of the substrate having at least one conductive track set apart for a temporary electrical connection with a contact card-reader device, characterized in that it furthermore includes - providing a connection unit having a flexible film comprising a substrate, called substrate of the connection unit, and a conductive layer, said substrate of the connection unit having a first main face and a second main face, the conductive layer being colaminated on one of these main faces, this conductive layer including at least one connection pad having a first portion and a second portion that are connected electrically to one another, the connection unit including a solder material deposited at least on the second portion, over a thickness of between 0.02 and 0.5 mm, before being laminated between the layers of plastic, - connecting one of the ends of the antenna to the first portion of the conductive layer of the connection pad, and - connecting one of the conductive tracks (415, 416) of the module to the second portion of the conductive layer of the connection pad, this second portion having a plurality of perforations.