  Red quasars are thought to be an intermediate population between
merger-driven star-forming galaxies in dust-enshrouded phase and normal
quasars. If so, they are expected to have high accretion ratios, but their
intrinsic dust extinction hampers reliable determination of Eddington ratios.
Here, we compare the accretion rates of 16 red quasars at $z \sim 0.7$ to those
of normal type 1 quasars at the same redshift range. The red quasars are
selected by their red colors in optical through near-infrared (NIR) and radio
detection. The accretion rates of the red quasars are derived from the P$\beta$
line in NIR spectra, which is obtained by the SpeX on the Infrared Telescope
Facility (IRTF) in order to avoid the effects of dust extinction. We find that
the measured Eddington ratios ($L_{\rm bol}$/$L_{\rm Edd} \simeq 0.69$) of red
quasars are significantly higher than those of normal type 1 quasars, which is
consistent with a scenario in which red quasars are the intermediate population
and the black holes of red quasars grow very rapidly during such a stage.
