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We present new results of a deep optical imaging survey using a narrowbandfilter ($NB921$) centered at $\lambda =$ 9196 \AA ~ together with $B$, $V$,$R$, $i^\prime$, and $z^\prime$ broadband filters in the sky area of the SubaruDeep Field which has been promoted as one of legacy programs of the 8.2m SubaruTelescope. We obtained a photometric sample of 58 Ly$\alpha$ emitter candidatesat $z \approx$ 6.5 -- 6.6 among $\sim 180$ strong $NB921$-excess ($z^\prime -NB921 > 1.0$) objects together with a color criterion of $i^\prime - z^\prime >1.3$. We then obtained optical spectra of 20 objects in our $NB921$-excesssample and identified at least nine Ly$\alpha$ emitters at $z \sim 6.5$ -- 6.6including the two emitters reported by Kodaira et al. (2003). Since ourLy$\alpha$ emitter candidates are free from strong amplification ofgravitational lensing, we are able to discuss their observational propertiesfrom a statistical point of view. Based on these new results, we obtain a lowerlimit of the star formation rate density of $\rho_{\rm SFR} \simeq 5.5 \times10^{-4}$ $h_{0.7}$ $M_\odot$ yr$^{-1}$ Mpc$^{-3}$ at $z \approx 6.6$, beingconsistent with our previous estimate. We discuss the nature of star-formationactivity in galaxies beyond $z=6$.Comment: 49 pages, 16 figures, PASJ, Vol. 57, No. 1, in pres

The SUBARU Deep Field Project: Lymanα Emitters at a Redshift of 6.6