A stretchable wiring board comprising: a stretchable substrate; a first stretchable wiring line; an insulating layer; and a second stretchable wiring line, wherein: the first stretchable wiring line, the insulating layer, and the second stretchable wiring line are arranged in a first region so as to sequentially overlap on a surface of the stretchable substrate; the insulating layer and the second stretchable wiring line are arranged in a second region adjacent to the first region so as to sequentially overlap on the surface of the stretchable substrate; the second stretchable wiring line is arranged on the surface of the stretchable substrate in a third region adjacent to the second region; the first stretchable wiring line extends over the first region but not over the second region nor over the third region; the insulating layer extends over the first region and the second region but not over the third region; the second stretchable wiring line extends over the first region, the second region, and the third region; and when a thickness of the first stretchable wiring line is defined as Z1, a thickness of the insulating layer is defined as Z2, and a thickness of the second stretchable wiring line is defined as Z3 at a position in the first region where a total thickness of the first stretchable wiring line, the insulating layer, and the second stretchable wiring line becomes maximum, and when the thickness of the second stretchable wiring line at a boundary between the second region and the third region is defined as X, the stretchable wiring board satisfies a relationship that X is smaller than Z1 + Z2 + Z3, characterized in that the stretchable wiring board satisfies a relationship that X is larger than a larger of Z1 + Z2 and Z2 + Z3. a stretchable substrate; a first stretchable wiring line; an insulating layer; and a second stretchable wiring line, wherein: the first stretchable wiring line, the insulating layer, and the second stretchable wiring line are arranged in a first region so as to sequentially overlap on a surface of the stretchable substrate; the insulating layer and the second stretchable wiring line are arranged in a second region adjacent to the first region so as to sequentially overlap on the surface of the stretchable substrate; the second stretchable wiring line is arranged on the surface of the stretchable substrate in a third region adjacent to the second region; the first stretchable wiring line extends over the first region but not over the second region nor over the third region; the insulating layer extends over the first region and the second region but not over the third region; the second stretchable wiring line extends over the first region, the second region, and the third region; and when a thickness of the first stretchable wiring line is defined as Z1, a thickness of the insulating layer is defined as Z2, and a thickness of the second stretchable wiring line is defined as Z3 at a position in the first region where a total thickness of the first stretchable wiring line, the insulating layer, and the second stretchable wiring line becomes maximum, and when the thickness of the second stretchable wiring line at a boundary between the second region and the third region is defined as X, the first stretchable wiring line, the insulating layer, and the second stretchable wiring line are arranged in a first region so as to sequentially overlap on a surface of the stretchable substrate; the insulating layer and the second stretchable wiring line are arranged in a second region adjacent to the first region so as to sequentially overlap on the surface of the stretchable substrate; the second stretchable wiring line is arranged on the surface of the stretchable substrate in a third region adjacent to the second region; the first stretchable wiring line extends over the first region but not over the second region nor over the third region; the insulating layer extends over the first region and the second region but not over the third region; the second stretchable wiring line extends over the first region, the second region, and the third region; and when a thickness of the first stretchable wiring line is defined as Z1, a thickness of the insulating layer is defined as Z2, and a thickness of the second stretchable wiring line is defined as Z3 at a position in the first region where a total thickness of the first stretchable wiring line, the insulating layer, and the second stretchable wiring line becomes maximum, and when the thickness of the second stretchable wiring line at a boundary between the second region and the third region is defined as X, the stretchable wiring board satisfies a relationship that X is smaller than Z1 + Z2 + Z3, characterized in that the stretchable wiring board satisfies a relationship that X is larger than a larger of Z1 + Z2 and Z2 + Z3.