  We study how the noncommutative spacetime affects on inflation. First we
obtain the noncommutative power spectrum of the curvature perturbations
produced during inflation in the slow-roll approximation. This is the explicit
$k$-dependent power spectrum up to first order in slow-roll parameters
$\epsilon_1 \delta_1$ including the noncommutative parameter $\mu$. In order to
test the role of $\mu$ further, we calculate the noncommutative power spectrum
using the slow-roll expansion. We find corrections which arise from the change
of pivot scale and a noncommutative parameter with $\mu\not=$ constant. It
turns out that the noncommutative parameter $\mu$ could be considered as a
zeroth order slow-roll parameter and the noncommutative spacetime effect
suppresses the power spectrum.
