  We apply the idea of spiral inflation to Coleman-Weinberg potential, and show
that inflation matching well observations is allowed for a symmetry-breaking
scale ranging from an intermediate scale to GUT scale even if the quartic
coupling $\lambda$ is of $\mathcal{O}(0.1)$. The tensor-to-scalar ratio can be
of $\mathcal{O}(0.01)$ in case of GUT scale symmetry-breaking.
