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In each of plural coaxial cables 11, a tip portion of an outer sheath 12 is removed and portions of an outer conductor 13, an insulator 14, and a center conductor 15 are exposed in this order in a step-like manner. A ground bar 20 having lock nails 23 for locking the coaxial cables 11 individually i

In each of plural coaxial cables 11, a tip portion of an outer sheath 12 is removed and portions of an outer conductor 13, an insulator 14, and a center conductor 15 are exposed in this order in a step-like manner. A ground bar 20 having lock nails 23 for locking the coaxial cables 11 individually is fastened to the exposed portions of the outer conductors 13. The coaxial cables 11 are fixed being sandwiched between the ground bar 20 and a pressing member 13.

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What is claimed is: 1. A coaxial flat cable comprising: plural coaxial cables arranged in parallel with each other in each of which a tip portion of an outer sheath is removed and portions of an outer conductor, an insulator, and a center conductor are exposed in this order in a step-like manner; a

What is claimed is: 1. A coaxial flat cable comprising: plural coaxial cables arranged in parallel with each other in each of which a tip portion of an outer sheath is removed and portions of an outer conductor, an insulator, and a center conductor are exposed in this order in a step-like manner; a conductor ground bar having a first row and a second row of lock projections, each of the lock projections locking each of the coaxial cables individually, the conductor ground bar being fastened to the exposed portions of the outer conductors to fix a pitch of the plural coaxial cables, wherein the center conductors are arranged at approximately equal intervals, the coaxial cables are sandwiched to be fixed by a pressing member and the conductor ground bar, and the first row of the lock projections locks the outer conductors and the second row of the lock projections locks the outer sheaths or the insulators. 2. A coaxial flat cable comprising: plural coaxial cables arranged parallel with each other in each of which a tip portion of an outer sheath is removed and portions of an outer conductor, an insulator, and a center conductor are exposed in this order in a step-like manner; a ground bar having lock projections, each of the lock projections locking each of the coaxial cables individually, the ground bar being fastened to the exposed portions of the outer conductors to fix a pitch of the coaxial cables, wherein the center conductors are arranged at approximately equal intervals, the exposed portions of the center conductors are bonded to at least one of insulating cover members, the exposed portions of the center conductors are bonded to the insulating cover members from both side of a parallel arrangement plane of the center conductors, and at least one of the insulating cover members has a window through which parts of the exposed portions of the center conductors are accessible. 3. The coaxial flat cable according to claim 2, wherein only one of the insulating cover members has a window, and a reinforcement member is stuck to the insulating cover member not having a window. 4. The coaxial flat cable according to claim 3, wherein the reinforcement member is interposed between the exposed portions of the center conductors and the insulating cover member, and the reinforcement member is formed with grooves or spacers for fixing the exposed portions of the center conductors at a prescribed pitch. 5. A coaxial flat cable comprising: plural coaxial cables arranged parallel with each other in each of which a tip portion of an outer sheath is removed and portions of an outer conductor, an insulator, and a center conductor are exposed in this order in a step-like manner; a ground bar having lock projections, each of the lock projections locking each of the coaxial cables individually, the ground bar being fastened to the exposed portions of the outer conductors to fix a pitch of the coaxial cables; wherein each of the exposed portions of the center conductors has two flat surfaces that are parallel with a parallel arrangement plane of the center conductors, both flat surfaces of each center conductor are covered with respective insulating cover members, and at least one of the insulating cover members adjacent to one of the flat surfaces has a window through which parts of the exposed portions of the center conductors are accessible. 6. The coaxial flat cable according to claim 5, wherein tip portions of the center conductors are cut away to produce tip faces that are flush with each other so that the center conductors do not project from the insulating cover members. 7. The coaxial flat cable according to claim 5, wherein only the insulating cover member adjacent to the one flat surfaces has a window, and a reinforcement member is interposed between the other insulating cover member and the exposed portions of the center conductors. 8. A manufacturing method of a coaxial flat cable, comprising the steps of: removing a tip portion of an outer sheath of each of plural coaxial cables and exposing portions, having prescribed lengths, of an outer conductor, an insulator, and a center conductor in this order in a step-like manner; locking the exposed portions of at least the outer conductors by lock projections of a ground bar to position the coaxial cables at a prescribed pitch; fastening the ground bar to the exposed portions of the outer conductors in a state that the center conductors are arranged at approximately equal intervals; rolling at least the exposed portions of the center conductors from both side of a parallel arrangement plane of the center conductors so as to produce a first and a second flat surfaces thereby flattening the exposed portions of the center conductors so that flattened surfaces are made parallel with a parallel arrangement plane of the center conductors; covering the first flat surface of the center conductors with a first insulating cover member; and covering the second flat surface with a second insulating cover member having a window for rendering parts of the exposed portions of the center conductors accessible, wherein the exposed portions of the center conductors are bonded to the first and the second insulating cover members. 9. The manufacturing method according to claim 8, wherein after both flat surfaces of each center conductor are covered with the first and the second insulating cover members, respectively, tip portions of the center conductors are cut away to produce tip faces that are flush with each other so that the center conductors do not project from the first and the second insulating cover members. 10. The manufacturing method according to claim 8, wherein the first insulating cover member covering the center conductors does not have a window, and a reinforcement member is interposed between the exposed portions of the center conductors and the first insulating cover member not having a window.