A transmission device according to one embodiment of the present disclosure is provided with: three output terminals arranged in one row; and three pairs of inductor elements and ESD protection elements, one of the pairs being provided for each of the output terminals. The three output terminals are respectively connected to three transmission channels, one by one. The three pairs of inductor elements and ESD protection elements are arranged side by side in a direction non-perpendicular to the direction in which the three output terminals are arranged. This transmission device is also providedwith a driver circuit which outputs three operation signals for the three output terminals through the three pairs of inductor elements and ESD protection elements.