Odaiba can be accessed by either the monorail, train, or ferry. The monorail is owned by New Transit which has a single line going into Odaiba, namely the Yurikamome Line. Transfer at JR Shimbashi Station for the Yurikamome. Note, this monorail is driverless and fully autonomous.
The train is on the Rinkai Line owned by Area Rapid Transit and connects to the JR Saikyo Line at JR Osaki Station.
The ferry is operated by Tokyo Cruise waterbus and stops along multiple locations on Odaiba.