A contactless information carrier, comprising: an IC chip having a first electrode and a second electrode; and a spiral wiring having a first end portion and a second end portion electrically connected to the first electrode and the second electrode, respectively, wherein: the IC chip is provided with: a first insulating film on the first electrode and the second electrode; a first relay wiring on the first insulating film, and a second insulating film on the first relay wiring; the spiral wiring is formed on the second insulating film; the first end portion and the second end portion are positioned on an inner peripheral side and an outer peripheral side of the spiral wiring, respectively; the first electrode and the second electrode are positioned on the outer peripheral side of the spiral wiring; and the first relay wiring is connected to the first electrode via a first connecting hole formed in the first insulating film and is connected to the first end portion via a third connecting hole formed in the second insulating film, and includes a rectangular region comprising one side in an X-axis direction and another side in a Y-axis direction and diagonally including the first connecting hole and the third connecting hole; wherein the first relay wiring is in a shape of a rectangle comprising a first side (Sx) in the X-axis direction and a second side (Sy) in the Y-axis direction, the spiral wiring is intersected on two intersecting sides of the rectangle in the X-axis direction and the Y-axis direction, respectively, and a respective length (Lx, Ly) of the first side (Sx) of the rectangle and the second side (Sy) of the rectangle at each intersecting side with the spiral wiring is larger than a respective total wiring width (Zx, Zy) of the spiral wiring. an IC chip having a first electrode and a second electrode; and a spiral wiring having a first end portion and a second end portion electrically connected to the first electrode and the second electrode, respectively, wherein: the IC chip is provided with: a first insulating film on the first electrode and the second electrode; a first relay wiring on the first insulating film, and a second insulating film on the first relay wiring; the spiral wiring is formed on the second insulating film; the first end portion and the second end portion are positioned on an inner peripheral side and an outer peripheral side of the spiral wiring, respectively; the first electrode and the second electrode are positioned on the outer peripheral side of the spiral wiring; and the first relay wiring is connected to the first electrode via a first connecting hole formed in the first insulating film and is connected to the first end portion via a third connecting hole formed in the second insulating film, and includes a rectangular region comprising one side in an X-axis direction and another side in a Y-axis direction and diagonally including the first connecting hole and the third connecting hole; the IC chip is provided with: a first insulating film on the first electrode and the second electrode; a first relay wiring on the first insulating film, and a second insulating film on the first relay wiring; a first insulating film on the first electrode and the second electrode; a first relay wiring on the first insulating film, and a second insulating film on the first relay wiring; the spiral wiring is formed on the second insulating film; the first end portion and the second end portion are positioned on an inner peripheral side and an outer peripheral side of the spiral wiring, respectively; the first electrode and the second electrode are positioned on the outer peripheral side of the spiral wiring; and the first relay wiring is connected to the first electrode via a first connecting hole formed in the first insulating film and is connected to the first end portion via a third connecting hole formed in the second insulating film, and includes a rectangular region comprising one side in an X-axis direction and another side in a Y-axis direction and diagonally including the first connecting hole and the third connecting hole; is connected to the first electrode via a first connecting hole formed in the first insulating film and is connected to the first end portion via a third connecting hole formed in the second insulating film, and includes a rectangular region comprising one side in an X-axis direction and another side in a Y-axis direction and diagonally including the first connecting hole and the third connecting hole;