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We have carried out a wide-field imaging survey for [OII]3727 emittinggalaxies at z~1.2 in the HST COSMOS 2 square degree field using the Suprime-Camon the Subaru Telescope. The survey covers a sky area of 6700 arcmin^2 in theCOSMOS field, and a redshift range between 1.17 and 1.20 (Delta_z = 0.03),corresponding to a survey volume of 5.56*10^5 Mpc^3. We obtain a sample of 3176[OII] emitting galaxies with observed emission-line equivalent widths greaterthan 26 AA. Since our survey tends to sample brighter [OII]3727 emittinggalaxies, we also analyze a sample of fainter [OII]3727 emitting galaxies foundin the Subaru Deep Field (SDF). We find an extinction-corrected [OII]luminosity density of 10^{40.35^+0.08_-0.06} ergs s^-1 Mpc-3, corresponding tostar formation rate density of 0.32^+0.06_-0.04 M_sun yr-1 Mpc^-3 in the COSMOSfield at z~1.2. This is the largest survey for [OII]3727 emitters beyond z=1currently available.Comment: 33 pages, 9 figures. to appear in the ApJ Supplement COSMOS Special  Issu

The [Oii] λ3727 Luminosity Function and Star Formation Rate atz ≈ 1.2 in the COSMOS 2 Square Degree Field and the Subaru Deep Field