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A rubber crawler which includes: a rubber crawler body having an endless belt shape and which has a left-right pair of rolling wheel passing surfaces on the inner circumferential surface thereof; a steel cord layer in which a plurality of steel cords extending in the crawler circumference direction

A rubber crawler which includes: a rubber crawler body having an endless belt shape and which has a left-right pair of rolling wheel passing surfaces on the inner circumferential surface thereof; a steel cord layer in which a plurality of steel cords extending in the crawler circumference direction are embedded in the rubber crawler body so as to be arranged in the crawler width direction, and a plurality of bias reinforcing layers that are disposed on the outer circumferential side of this steel cord layer in the rubber crawler body, in which the left-right pair of rolling wheel passing surfaces are disposed on the inner circumferential surface of the rubber crawler body at positions corresponding to the respective end portions in the crawler width direction of the steel cord layer and the plurality of bias reinforcing layers; the rubber crawler further includes: a rubber layer disposed between an innermost reinforcing layer that is positioned on the innermost side of the plurality of bias reinforcing layers and the steel cord layer, at least at positions corresponding to the end portions of the innermost reinforcing layer in the crawler width direction.

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1. A rubber crawler comprising: a rubber crawler body having an endless belt shapeand comprising a left-right pair of rolling wheel passing surfaces on the inner circumferential surface thereof;a steel cord layer in which a plurality of steel cords extending in a crawler circumference direction are

1. A rubber crawler comprising: a rubber crawler body having an endless belt shapeand comprising a left-right pair of rolling wheel passing surfaces on the inner circumferential surface thereof;a steel cord layer in which a plurality of steel cords extending in a crawler circumference direction are embedded in the rubber crawler body so as to be arranged in the crawler width direction;a plurality of bias reinforcing layers that is disposed on the outer circumferential side of this steel cord layer in the rubber crawler body; anda rubber layer disposed between an innermost reinforcing layer that is positioned on the innermost side of the plurality of bias reinforcing layers and the steel cord layer, at least at positions corresponding to the end portions of the innermost reinforcing layer in the crawler width direction,wherein the left-right pair of rolling wheel passing surfaces are disposed on the inner circumferential surface of the rubber crawler body at positions corresponding to the respective end portions in the crawler width direction of the steel cord layer and the plurality of bias reinforcing layers,wherein the rubber layer is formed with a material that has a loss tangent that is lower than the loss tangent of the material that forms the rubber crawler body. 2. The rubber crawler according to claim 1, wherein the rubber layer is disposed along the entire region in the crawler width direction between the steel cord layer and the innermost reinforcing layer; and the thickness of a center portion of the rubber layer in the crawler width direction is thinner than the thickness of the end portions. 3. The rubber crawler according to claim 2, wherein the inner surface of the rubber layer on the side of the steel cord layer extends in a parallel manner along the crawler width direction over the entire region thereof, and among the outer surface on the side of the bias reinforcing layers, the portion that is positioned at the end portions in the crawler width direction projects out further to the side of the bias reinforcing layers than the portion that is positioned in the center portion, and the plurality of bias reinforcing layers respectively extend in the crawler width direction along the outer surface of the rubber layer, in the cross sectional view along the crawler width direction. 4. A crawler-type traveling body comprising: a driving wheel, a driven wheel, a rubber crawler that is wound in an endless belt shape between both wheels, and a plurality of rolling wheels that are disposed on at least a left-right pair of rolling wheel passing surfaces that are formed on the inner circumferential surface of the rubber crawler and that are made to roll in response to the sending movement of the rubber crawler;wherein the rubber crawler is the rubber crawler according to claim 3. 5. A crawler-type traveling body comprising: a driving wheel, a driven wheel, a rubber crawler that is wound in an endless belt shape between both wheels, and a plurality of rolling wheels that are disposed on at least a left-right pair of rolling wheel passing surfaces that are formed on the inner circumferential surface of the rubber crawler and that are made to roll in response to the sending movement of the rubber crawler;wherein the rubber crawler is the rubber crawler according to claim 2. 6. A crawler-type traveling body comprising: a driving wheel, a driven wheel, a rubber crawler that is wound in an endless belt shape between both wheels, and a plurality of rolling wheels that are disposed on at least a left-right pair of rolling wheel passing surfaces that are formed on the inner circumferential surface of the rubber crawler and that are made to roll in response to the sending movement of the rubber crawler;wherein the rubber crawler is the rubber crawler according to claim 1. 7. A rubber crawler comprising: a rubber crawler body having an endless belt shapeand comprising a left-right pair of rolling wheel passing surfaces on the inner circumferential surface thereof;a steel cord layer in which a plurality of steel cords extending in a crawler circumference direction are embedded in the rubber crawler body so as to be arranged in the crawler width direction;a plurality of bias reinforcing layers that is disposed on the outer circumferential side of this steel cord layer in the rubber crawler body; anda rubber layer disposed between an innermost reinforcing layer that is positioned on the innermost side of the plurality of bias reinforcing layers and the steel cord layer, at least at positions corresponding to the end portions of the innermost reinforcing layer in the crawler width direction,wherein the left-right pair of rolling wheel passing surfaces are disposed on the inner circumferential surface of the rubber crawler body at positions corresponding to the respective end portions in the crawler width direction of the steel cord layer and the plurality of bias reinforcing layers,wherein the rubber layer is disposed along the entire region in the crawler width direction between the steel cord layer and the innermost reinforcing layer; andthe thickness of a center portion of the rubber layer in the crawler width direction is thinner than the thickness of the end portions. 8. The rubber crawler according to claim 7, wherein the inner surface of the rubber layer on the side of the steel cord layer extends in a parallel manner along the crawler width direction over the entire region thereof, and among the outer surface on the side of the bias reinforcing layers, the portion that is positioned at the end portions in the crawler width direction projects out further to the side of the bias reinforcing layers than the portion that is positioned in the center portion, and the plurality of bias reinforcing layers respectively extend in the crawler width direction along the outer surface of the rubber layer, in the cross sectional view along the crawler width direction. 9. A crawler-type traveling body comprising: a driving wheel, a driven wheel, a rubber crawler that is wound in an endless belt shape between both wheels, and a plurality of rolling wheels that are disposed on at least a left-right pair of rolling wheel passing surfaces that are formed on the inner circumferential surface of the rubber crawler and that are made to roll in response to the sending movement of the rubber crawler;wherein the rubber crawler is the rubber crawler according to claim 8. 10. A crawler-type traveling body comprising: a driving wheel, a driven wheel, a rubber crawler that is wound in an endless belt shape between both wheels, and a plurality of rolling wheels that are disposed on at least a left-right pair of rolling wheel passing surfaces that are formed on the inner circumferential surface of the rubber crawler and that are made to roll in response to the sending movement of the rubber crawler;wherein the rubber crawler is the rubber crawler according to claim 7.