Non-pneumatic tire

1. A non-pneumatic tire comprising: an inner annular portion; an outer annular portion provided concentrically on an outer side of the inner annular portion;

a plurality of coupling portions which couple the inner annular portion and the outer annular portion to each other and are provided independently of one another in a tire circumferential direction;

at least one annular overall reinforcing layer embedded entirely in the outer annular portion in a tire width direction; and

at least one annular partial reinforcing layer embedded only in a part of the outer annular portion in the tire width direction,

wherein the outer annular portion includes an annular connecting region to which the plurality of coupling portions are connected, and an annular non-connecting region to which the plurality of coupling portions are not connected, in the tire width direction,

wherein the partial reinforcing layer overlaps the non-connecting region in a tire radial direction when viewed from the tire circumferential direction, and

wherein a plurality of the overall reinforcing layers are provided, and the partial reinforcing layer is disposed between the plurality of overall reinforcing layers.

2. The non-pneumatic tire according to claim 1 , wherein the partial reinforcing layer overlaps the non-connecting region by 80% or more of a width of the non-connecting region.

3. The non-pneumatic tire according to claim 1 , wherein an end portion of the partial reinforcing layer in the tire width direction is located in the connecting region.

4. The non-pneumatic tire according to claim 1 , wherein the partial reinforcing layer is composed of reinforcing fibers, and the reinforcing fibers are arrayed in a direction inclined by 0 to 45° with respect to the tire circumferential direction.

5. The non-pneumatic tire according to claim 1 , wherein a width of the partial reinforcing layer in the tire width direction is 80 to 150% of a width of the non-connecting region in the tire width direction.