  We report 1.1 mm number counts revealed with the Atacama Large
Millimeter/submillimeter Array (ALMA) in the Subaru/XMM-Newton Deep Survey
Field (SXDF). The advent of ALMA enables us to reveal millimeter-wavelength
number counts down to the faint end without source confusion. However, previous
studies are based on the ensemble of serendipitously-detected sources in fields
originally targeting different sources and could be biased due to the
clustering of sources around the targets. We derive number counts in the flux
range of 0.2-2 mJy by using 23 (>=4sigma) sources detected in a continuous 2.0
arcmin$^2$ area of the SXDF. The number counts are consistent with previous
results within errors, suggesting that the counts derived from
serendipitously-detected sources are not significantly biased, although there
could be field-to-field variation due to the small survey area. By using the
best-fit function of the number counts, we find that ~40% of the extragalactic
background light at 1.1 mm is resolved at S(1.1mm) > 0.2 mJy.
