Provided is a stretchable circuit board having a sheet-like stretchable base capable of stretching and contracting, a stretchable interconnect part formed on or above at least one major surface of the stretchable base, and an external terminal connected to the interconnect part; the stretchable circuit board has a reinforcing area having in-plane rigidity higher than that of the stretchable base, and a stretchable area which remains after excluding the reinforcing area; the interconnect part is formed across a boundary part between the reinforcing area and the stretchable area; and a sheet-like stretchable auxiliary member capable of stretching and contracting is provided to the boundary part having the interconnect part formed therein.