  We present the results of a survey for Ly$\alpha$ emitters at $z\approx 5.7$
based on optical narrow-band ($\lambda_{\rm c} = 8150$ \AA ~ and $\Delta\lambda
= 120$ \AA), and broad-band ($B$, $R_{\rm C}$, $I_{\rm C}$, and $z^\prime$)
observations of the field surrounding the high redshift quasar, SDSSp
J104433.04$-$012522.2, on the 8.2 m Subaru Telescope with the Subaru Prime
Focus Camera, Suprime-Cam. This survey covers a sky area of $\approx 720$
arcmin$^2$ and a co-moving volume of $\simeq 2 \times 10^5 ~ h_{0.7}^{-3}$
Mpc$^3$. We have found 20 candidates of Ly$\alpha$ emitters at $z \approx$ 5.7
with $\Delta z \approx 0.1$. Two of them have been confirmed star-forming
galaxies at $z=5.655$ and $z=5.687$ from our follow-up optical spectroscopy. We
discuss star-formation properties of the 20 objects from a statistical point of
view. Our survey leads to a new estimate of the star formation rate density at
$z \approx 5.7$, $\sim 1.2 \times 10^{-3} h_{0.7} M_\odot$ yr$^{-1}$
Mpc$^{-3}$.
