Mounting assembly and cable assembly

A mounting assembly provided with:

• a cable assembly including a plurality of signal lines each of which is formed by a core wire, an inner insulating body which covers the core wire, an outer conducting body which covers the inner insulating body, and an outer insulating body which covers the outer conducting body;
• and a substrate to be connected to the cable assembly, wherein
• the cable assembly includes a fixation member that fixes the plurality of signal lines in a predetermined array state, wherein
• the signal lines are formed in a manner of exposing respective outer conducting bodies from respective outer insulating bodies in an area at least including respective distal edges,
• the fixation member fixes the signal lines in a state where side surfaces of neighboring outer conducting bodies among the exposed outer conducting bodies are in contact and in a manner of exposing respective edge faces of the plurality of outer conducting bodies and respective edge faces of the plurality of core wires, and
• the substrate includes an electrode part formation surface which is a surface on which a plurality of core wire electrode parts and an outer conducting body electrode part are formed and faces an edge face exposure surface of the fixation member, the plurality of core wire electrode parts being connected to the respective edge faces of the core wires in the plurality of signal lines and the outer conducting body electrode part being connected to a part of the edge faces of the plurality of outer conducting bodies fixed in the state where the side surfaces are in contact.