  We study a radion model for inflation and density perturbation identifying
the scalar field arising from the five-dimensional gravity on $M_4 x S^1$ with
the inflaton. The inflaton potential arising from 5D graviton and matter
one-loop effects is shown to possess the desirable slow-roll property. This
radion model contains only a small number of parameters and there is an ample
parameter region which reproduces (without fine-tuning) all precision
astrophysical data.
