1. A stretchable circuit board comprising:a first sheet member including a first main surface having a terminal portion formed thereon;
a second sheet member having a main surface and stretchability higher than that of the first sheet member, and joined to the first sheet member;
the main surface of the second sheet member opposed to the main surface of the first sheet member includes a stretchable wiring portion which is a printed pattern including a resin binder and a conductive material, wherein the stretchable wiring portion directly contacts the terminal portion between the first sheet member and the second sheet member, and
wherein the stretchable wiring portion is a series of layers from the terminal portion to an area on the second sheet member that does not overlap with the first sheet member, and the stretchable wiring portion has a constant width when viewed from above.