Disclosed is an electronic apparatus including a circuit element including a first main surface, a first electrode provided in the first main surface, an optical element including a second main surface and being configured to either transmit or receive an optical signal, a second electrode provided in the second main surface, a window which is provided in the second main surface and through which the optical signal passes, a wiring layer provided on the first main surface and the second main surface, the wiring layer electrically connecting the first electrode and the second electrode, and an optical waveguide, which is provided on the second main surface and optically connected to the window, the optical signal passing through the optical waveguide.