An airless tire , comprising: a tread ring having a cylindrical form and a ground contact surface ; a hub formed on a radial direction inner side of the tread ring and configured to be fixed to an axle; and a spoke structure connecting the tread ring and the hub , wherein the tread ring comprises a tread rubber layer having the ground contact surface , a first reinforcing cord layer formed closest to the tread rubber layer , a second reinforcing cord layer formed on a radial direction inner side of the first reinforcing cord layer , and a shear rubber layer formed between the first and second reinforcing cord layers , the first and second reinforcing cord layers and the shear rubber layer are formed such that a ratio Eb 1 /Ee between a tire circumferential direction tensile modulus Eb 1 of the first reinforcing cord layer and a shear modulus Ee of the shear rubber layer is 100 or greater and that a ratio Eb 2 /Ee between a tire circumferential direction tensile modulus Eb 2 of the second reinforcing cord layer and the shear modulus Ee of the shear rubber layer is 100 or greater, characterized in that each of the first and second reinforcing cord layers has a topping rubber having a loss tangent tanδb in a range of 0.03 to 0.10 and a tensile modulus E*b in a range of 4 to 20 MPa, wherein the loss tangent tanδb and the tensile modulus E*b of the topping rubber are values that are measured according to JIS-K6394 using a viscoelasticity spectrometer for predetermined initial strain of 10%, dynamic strain of ±1%, frequency of 10Hz, tensile deformation mode, and measurement temperature of 30 °C. a tread ring having a cylindrical form and a ground contact surface ; a hub formed on a radial direction inner side of the tread ring and configured to be fixed to an axle; and a spoke structure connecting the tread ring and the hub , wherein the tread ring comprises a tread rubber layer having the ground contact surface , a first reinforcing cord layer formed closest to the tread rubber layer , a second reinforcing cord layer formed on a radial direction inner side of the first reinforcing cord layer , and a shear rubber layer formed between the first and second reinforcing cord layers , the first and second reinforcing cord layers and the shear rubber layer are formed such that a ratio Eb 1 /Ee between a tire circumferential direction tensile modulus Eb 1 of the first reinforcing cord layer and a shear modulus Ee of the shear rubber layer is 100 or greater and that a ratio Eb 2 /Ee between a tire circumferential direction tensile modulus Eb 2 of the second reinforcing cord layer and the shear modulus Ee of the shear rubber layer is 100 or greater, characterized in that each of the first and second reinforcing cord layers has a topping rubber having a loss tangent tanδb in a range of 0.03 to 0.10 and a tensile modulus E*b in a range of 4 to 20 MPa, wherein the loss tangent tanδb and the tensile modulus E*b of the topping rubber are values that are measured according to JIS-K6394 using a viscoelasticity spectrometer for predetermined initial strain of 10%, dynamic strain of ±1%, frequency of 10Hz, tensile deformation mode, and measurement temperature of 30 °C. <EOS>