Anon-pneumatic tire comprising: an attachment body attachable to an axle; an outer tubular body configured to surround the attachment body from the outside in a tire radial direction; and connecting members configured to connect the attachment body and the outer tubular body while allowing a displacement therebetween, the connecting members comprising elastic connecting plates (21, 22) having both ends connected to the attachment body and the outer tubular body and extending from the outer tubular body in a tire circumferential direction toward the inside in the tire radial direction; wherein a plurality of curved sections (21d, 22d, 21e, 22e) curved in the tire circumferential direction are formed at the elastic connecting plates (21, 22) in an extension direction in which the elastic connecting plates (21, 22) extend in a tire side view when the non-pneumatic tire is seen from a tire width direction such that curved directions are alternately opposite with each other in the extension direction; wherein each elastic connecting plate (21, 22) comprises an outer curved section (21e, 22e) disposed closest to the outer tubular body side in the extension direction and an inner curved section (21d, 22d) neighboring the outer curved section (21e, 22e) in the extension direction among the plurality of curved sections (21d, 22d, 21e, 22e), and an extension section (21i, 22i) extending throughout all of the curved sections (21d, 22d, 21e, 22e) and an inflection section (21g, 22g) is formed between all of the curved sections (21d, 22d, 21e, 22e): and wherein the outer tubular body and the plurality of connecting members are integrally formed of a synthetic resin material; the non-pneumatic tire being characterized in that the extension section (21i, 22i) extends along a reference line having radius of curvature larger than that of the outer curved section (21e, 22e) and the inner curved section (21d, 22d) in the tire side view, and extends from first end portions (21a, 22a) of the elastic connecting plates (21, 22) connected to the outer tubular body to arrive at a central portion of the inner curved section (21d, 22d) in at least the extension direction; the lateral cross-sectional area of the inflection section (21g, 22g) is smaller than a lateral cross-sectional area of other portions of the elastic connecting plates (21, 22) and the sizes of the inflection section (21g, 22g) in both the tire width direction and the tire circumferential direction are smaller than those of other portions of the elastic connecting plates (21, 22). an attachment body attachable to an axle; an outer tubular body configured to surround the attachment body from the outside in a tire radial direction; and connecting members configured to connect the attachment body and the outer tubular body while allowing a displacement therebetween, the connecting members comprising elastic connecting plates (21, 22) having both ends connected to the attachment body and the outer tubular body and extending from the outer tubular body in a tire circumferential direction toward the inside in the tire radial direction; wherein a plurality of curved sections (21d, 22d, 21e, 22e) curved in the tire circumferential direction are formed at the elastic connecting plates (21, 22) in an extension direction in which the elastic connecting plates (21, 22) extend in a tire side view when the non-pneumatic tire is seen from a tire width direction such that curved directions are alternately opposite with each other in the extension direction; wherein each elastic connecting plate (21, 22) comprises an outer curved section (21e, 22e) disposed closest to the outer tubular body side in the extension direction and an inner curved section (21d, 22d) neighboring the outer curved section (21e, 22e) in the extension direction among the plurality of curved sections (21d, 22d, 21e, 22e), and an extension section (21i, 22i) extending throughout all of the curved sections (21d, 22d, 21e, 22e) and an inflection section (21g, 22g) is formed between all of the curved sections (21d, 22d, 21e, 22e): and wherein the outer tubular body and the plurality of connecting members are integrally formed of a synthetic resin material; the non-pneumatic tire being characterized in that the extension section (21i, 22i) extends along a reference line having radius of curvature larger than that of the outer curved section (21e, 22e) and the inner curved section (21d, 22d) in the tire side view, and extends from first end portions (21a, 22a) of the elastic connecting plates (21, 22) connected to the outer tubular body to arrive at a central portion of the inner curved section (21d, 22d) in at least the extension direction; the lateral cross-sectional area of the inflection section (21g, 22g) is smaller than a lateral cross-sectional area of other portions of the elastic connecting plates (21, 22) and the sizes of the inflection section (21g, 22g) in both the tire width direction and the tire circumferential direction are smaller than those of other portions of the elastic connecting plates (21, 22).