An airless tire, comprising: a cylindrical tread ring with a contact patch; a hub positioned on the tire radially inner side of the tread ring and fixed to an axle; and a spoke made of a polymer material and connecting the tread ring and the hub, wherein the spoke is formed by integrating a tread-side annular component bonded to the inner circumferential surface of the tread ring, a hub-side annular component bonded to the outer circumferential surface of the hub, and a spoke plate radially extending from the hub-side annular component to the tread-side annular component, the spoke plate is configured to have a first tapered-thickness region (Ya) radially extending outward while gradually reducing thickness from a first connecting position (Pa) bonded to the hub-side annular component, a second tapered-thickness region (Yb) radially extending inward while gradually reducing thickness from a second connecting position (Pb) bonded to the tread-side annular component, and a minimum-thickness region (Ym) having a constant minimum thickness (Tmin) positioned between the tapered-thickness regions (Ya, Yb), tire radial length of the first tapered-thickness region (Ya) and tire radial length of the second tapered-thickness region (Yb) are each set to be at least 0.05 times the tire radial length of the spoke plate, and the spoke plate is configured to have a minimum-width region where the tire axial width has a minimum value (Wmin) between the first connecting position (Pa) and second connecting position (Pb), and the minimum value (Wmin) is set to be at least 0.5 times but less than 1.0 times the width (Wa) at the first connecting position (Pa), or at least 0.5 times but less than 1.0 times the width (Wb) at the second connecting position (Pb). a cylindrical tread ring with a contact patch; a hub positioned on the tire radially inner side of the tread ring and fixed to an axle; and a spoke made of a polymer material and connecting the tread ring and the hub, wherein the spoke is formed by integrating a tread-side annular component bonded to the inner circumferential surface of the tread ring, a hub-side annular component bonded to the outer circumferential surface of the hub, and a spoke plate radially extending from the hub-side annular component to the tread-side annular component, the spoke plate is configured to have a first tapered-thickness region (Ya) radially extending outward while gradually reducing thickness from a first connecting position (Pa) bonded to the hub-side annular component, a second tapered-thickness region (Yb) radially extending inward while gradually reducing thickness from a second connecting position (Pb) bonded to the tread-side annular component, and a minimum-thickness region (Ym) having a constant minimum thickness (Tmin) positioned between the tapered-thickness regions (Ya, Yb), tire radial length of the first tapered-thickness region (Ya) and tire radial length of the second tapered-thickness region (Yb) are each set to be at least 0.05 times the tire radial length of the spoke plate, and the spoke plate is configured to have a minimum-width region where the tire axial width has a minimum value (Wmin) between the first connecting position (Pa) and second connecting position (Pb), and the minimum value (Wmin) is set to be at least 0.5 times but less than 1.0 times the width (Wa) at the first connecting position (Pa), or at least 0.5 times but less than 1.0 times the width (Wb) at the second connecting position (Pb).