A terminal structure of a coaxial cable, wherein the terminal structure connects a terminal (23, 25) to the coaxial cable, the coaxial cable comprising, an internal conductor, an internal insulating layer covering an outer peripheral surface of the internal conductor, an external conductor covering an outer peripheral surface of the internal insulating layer, and an external insulating layer covering an outer peripheral surface of the external conductor, the terminal structure comprising: a conducting portion (lOd) which is provided on an end face (lOb) of the coaxial cable and which conducts the internal conductor and the external conductor to each other, an internal conductor portion on the side of the end face (1 Ob), the internal conductor portion being connected to the internal conductor via the conducting portion (lOd) and the external conductor; a removal portion provided at the rear side relative to the internal conductor portion, the removal portion being formed by circumferentially removing a part of the external conductor exposed from the external insulating layer; and an external conductor portion provided at the rear side relative to the removal portion, being shut off from the internal conductor portion by the removal portion, and being connected to the external conductor., characterized in that the terminal (23, 25) is provided on a flat circuit board, and an axial direction of the coaxial cable is parallel to a flat surface of the circuit board, and the internal conductor portion and the external conductor portion are formed in the outer peripheral surface of the external conductor exposed from the external insulation layer, and the internal conductor connection portion and the external conductor connection portion have the same diameter and they are the connection points between the coaxial cable and the terminal (23, 25). a conducting portion (lOd) which is provided on an end face (lOb) of the coaxial cable and which conducts the internal conductor and the external conductor to each other, an internal conductor portion on the side of the end face (1 Ob), the internal conductor portion being connected to the internal conductor via the conducting portion (lOd) and the external conductor; a removal portion provided at the rear side relative to the internal conductor portion, the removal portion being formed by circumferentially removing a part of the external conductor exposed from the external insulating layer; and an external conductor portion provided at the rear side relative to the removal portion, being shut off from the internal conductor portion by the removal portion, and being connected to the external conductor., characterized in that the terminal (23, 25) is provided on a flat circuit board, and an axial direction of the coaxial cable is parallel to a flat surface of the circuit board, and the internal conductor portion and the external conductor portion are formed in the outer peripheral surface of the external conductor exposed from the external insulation layer, and the internal conductor connection portion and the external conductor connection portion have the same diameter and they are the connection points between the coaxial cable and the terminal (23, 25).