To provide an end-processed coaxial cable attaining miniaturization and reduction in size, superior in adhesive strength even when the coaxial cable has a small diameter or a pitch distance between the cables is narrow, and preventing thermal damages to the surface of a dielectric layer and a deterioration of high-frequency characteristics.

In an end-processed coaxial cable, an end of a group (1) of coaxial cables is cut, at least at one end of a coaxial cable assembly including the group (1) of coaxial cables arranged in parallel at a predetermined pitch, and each central conductor (4) and an end of each shielding layer (2) of the group of coaxial cables are connected by soldering with a connection substrate (9) via a ground bar (8). While the ground bar (8) is brought into surface contact with a ground pattern (10) on the connecting substrate (9), a solder (5) is poured through a plurality of solder injection holes (12), formed in the ground pattern (10) on the rear surface of the connection substrate (9) and are connected by soldering the ground bar (8) with the ground pattern (10).