The service of surface access to Narita and Haneda airports in Tokyo metropolitan area has been continuously improved. Recently many routes of airport limousine have been opened and its market share has expanded. This study investigates access mode choice behavior of international air passenger in Tokyo metropolitan area. The data from "International air passenger survey" conducted by Ministry of Land, Infrastructure, Transport and Tourism, Japan is utilized in this study. Modal share of existing rapid train such as Narita Express and Keisei Sky Liner has been obviously derived by the limousine. To demonstrate the reasons of the market expansion of limousine, discrete choice model of access mode is estimated with multinomial logit model.