A cable assembly (A1, A2) comprising: a cable including: a tubular outer insulator having a first end portion on one side in a first direction (Y-Y'), a tubular outer conductor disposed inside the outer insulator, the outer conductor including a protruding portion protruding from the first end portion of the outer insulator towards the one side in the first direction, at least one tubular inner insulator disposed inside the outer conductor, the at least one inner insulator including a protruding portion protruding from the protruding portion of the outer conductor to the one side in the first direction (Y-Y'); and at least one inner conductor being disposed inside the at least one inner insulator and including a connecting portion, the connecting portion protruding from the protruding portion of the at least one inner insulator to the one side in the first direction (Y-Y'); a clamp (200, 200') made of metal, securely holding the protruding portion of the outer conductor and including a first end portion (210, 210') on the other side (Y') in the first direction (Y-Y'); and a tubular metal case (300, 300') including a tubular swaged portion (310, 310') housing at least the first end portion of the outer insulator and the first end portion (210, 210') of the clamp (200, 200'), characterized in that the clamp (200, 200') is a metal sheet wrapped around the protruding portion of the outer conductor, and the swaged portion (310, 310') is swaged from outside of the swaged portion such as to be in pressure contact with and fixed to at least the first end portion of the outer insulator and the first end portion (210, 210') of the clamp (200, 200') so that the first end portion of the outer insulator is elastically deformed and the first end portion (210, 210') of the clamp (200, 200') is plastically deformed. a cable including: a tubular outer insulator having a first end portion on one side in a first direction (Y-Y'), a tubular outer conductor disposed inside the outer insulator, the outer conductor including a protruding portion protruding from the first end portion of the outer insulator towards the one side in the first direction, at least one tubular inner insulator disposed inside the outer conductor, the at least one inner insulator including a protruding portion protruding from the protruding portion of the outer conductor to the one side in the first direction (Y-Y'); and at least one inner conductor being disposed inside the at least one inner insulator and including a connecting portion, the connecting portion protruding from the protruding portion of the at least one inner insulator to the one side in the first direction (Y-Y'); a tubular outer insulator having a first end portion on one side in a first direction (Y-Y'), a tubular outer conductor disposed inside the outer insulator, the outer conductor including a protruding portion protruding from the first end portion of the outer insulator towards the one side in the first direction, at least one tubular inner insulator disposed inside the outer conductor, the at least one inner insulator including a protruding portion protruding from the protruding portion of the outer conductor to the one side in the first direction (Y-Y'); and at least one inner conductor being disposed inside the at least one inner insulator and including a connecting portion, the connecting portion protruding from the protruding portion of the at least one inner insulator to the one side in the first direction (Y-Y'); a clamp (200, 200') made of metal, securely holding the protruding portion of the outer conductor and including a first end portion (210, 210') on the other side (Y') in the first direction (Y-Y'); and a tubular metal case (300, 300') including a tubular swaged portion (310, 310') housing at least the first end portion of the outer insulator and the first end portion (210, 210') of the clamp (200, 200'), characterized in that the clamp (200, 200') is a metal sheet wrapped around the protruding portion of the outer conductor, and the swaged portion (310, 310') is swaged from outside of the swaged portion such as to be in pressure contact with and fixed to at least the first end portion of the outer insulator and the first end portion (210, 210') of the clamp (200, 200') so that the first end portion of the outer insulator is elastically deformed and the first end portion (210, 210') of the clamp (200, 200') is plastically deformed.