A non-pneumatic tire comprising: an attachment body attached to an axle; an exterior body which is externally fitted to the attachment body; a ring-shaped body which surrounds the exterior body from the outside in a tire radial direction; and a coupling member which displaceably couples the exterior body and the ring-shaped body, wherein the coupling member includes an elastic coupling plate (21, 22) whose opposite ends (12b, 12a) are respectively coupled to the exterior body and the ring-shaped body, wherein a plurality of curved portions (21d - 21f, 22d - 22f) curved in a tire circumferential direction are formed in the elastic coupling plate (21, 22) in an extending direction in which the elastic coupling plate (21, 22) extends in a tire side view when the non-pneumatic tire is viewed from a tire width direction, and wherein curvature directions of curved portions (21d - 21f, 22d - 22f) adjacent to each other in the extending direction are opposite to each other, characterised in that: a size in the tire width direction and a transverse section area of the elastic coupling plate (21, 22) are minimum at only one of a plurality of inflection portions (21g, 21h, 22g, 22h) positioned between curved portions (21d - 21f, 22d - 22f) adjacent to each other in the extending direction of the elastic coupling plate (21, 22), wherein the size in the tire width direction and the transverse section area of the elastic coupling plate (21, 22) gradually decrease in the extending direction from opposite sides toward the one inflection portion (21g, 21h, 22g, 22h), and wherein the smallest transverse section area of the elastic coupling plate (21, 22) is provided at the inflection portion (21h, 22h) on the exterior body side amongst the plurality of inflection portions. an attachment body attached to an axle; an exterior body which is externally fitted to the attachment body; a ring-shaped body which surrounds the exterior body from the outside in a tire radial direction; and a coupling member which displaceably couples the exterior body and the ring-shaped body, wherein the coupling member includes an elastic coupling plate (21, 22) whose opposite ends (12b, 12a) are respectively coupled to the exterior body and the ring-shaped body, wherein a plurality of curved portions (21d - 21f, 22d - 22f) curved in a tire circumferential direction are formed in the elastic coupling plate (21, 22) in an extending direction in which the elastic coupling plate (21, 22) extends in a tire side view when the non-pneumatic tire is viewed from a tire width direction, and wherein curvature directions of curved portions (21d - 21f, 22d - 22f) adjacent to each other in the extending direction are opposite to each other, characterised in that: a size in the tire width direction and a transverse section area of the elastic coupling plate (21, 22) are minimum at only one of a plurality of inflection portions (21g, 21h, 22g, 22h) positioned between curved portions (21d - 21f, 22d - 22f) adjacent to each other in the extending direction of the elastic coupling plate (21, 22), wherein the size in the tire width direction and the transverse section area of the elastic coupling plate (21, 22) gradually decrease in the extending direction from opposite sides toward the one inflection portion (21g, 21h, 22g, 22h), and wherein the smallest transverse section area of the elastic coupling plate (21, 22) is provided at the inflection portion (21h, 22h) on the exterior body side amongst the plurality of inflection portions. a size in the tire width direction and a transverse section area of the elastic coupling plate (21, 22) are minimum at only one of a plurality of inflection portions (21g, 21h, 22g, 22h) positioned between curved portions (21d - 21f, 22d - 22f) adjacent to each other in the extending direction of the elastic coupling plate (21, 22), wherein the size in the tire width direction and the transverse section area of the elastic coupling plate (21, 22) gradually decrease in the extending direction from opposite sides toward the one inflection portion (21g, 21h, 22g, 22h), and wherein the smallest transverse section area of the elastic coupling plate (21, 22) is provided at the inflection portion (21h, 22h) on the exterior body side amongst the plurality of inflection portions.