The present invention relates to an optical transceiver that suppresses the EMI radiation through the optical receptacle and the discharge of the static electricity attributed to the optical connector through the optical receptacle. The optical transceiver of the invention includes an optical subassembly comprising a resin made sleeve cover in addition to a metal package and the metal sleeve assembly. Since the resin sleeve cover secures the tip of the sleeve assembly, the EMI discharge and the noise radiation through this sleeve cover can be suppressed. Moreover, the sleeve cover and the bush both included in the sleeve assembly form a united flange. Accordingly, the frame and the holder for positioning the optical subassembly are unnecessary to provide a specific structure.