Wing-In-Ground Effect (WIG) / Wing-In-Surface Effect Ship (WISES) is an unconventional aircraft/ship which utilizes the high lift-to-drag ratio in the ground effect. It is expected to be one of the fast-sea transportations between ships and airplanes. Up to now, many kinds of WIG crafts are developed. The authors have also designed a canard-configuration WIG taken over the concept of Kubo and Akimoto. In this paper, the steady aerodynamic properties and the aerodynamic interaction effect between wings are investigated by applying the theoretical calculation based on the potential theory and the wind tunnel experiment. The aerodynamic interaction effect due to propulsor are also made clear by activating the ducted fans mounted on the main wing in the wind tunnel experiment. Through the comparison between the calculations and experiments, the steady aerodynamic properties of the canard-configuration WIG are estimated well by the present theoretical calculation and it is useful as a preliminary design tools for the WIG crafts.