An electronic device includes a first electronic component including a first signal line and a first ground conductor surface, a second electronic component that is placed above the first electronic component and includes a second signal line and a second ground conductor surface opposed to the first ground conductor surface, a waveguide including the first ground conductor surface, the second ground conductor surface, and a pair of first ground conductor walls that are opposed to each other and are placed between the first ground conductor surface and the second ground conductor surface, a first transducing part that transduces a signal between the first signal line and the waveguide, and a second transducing part that transduces a signal between the second signal line and the waveguide.