A terminal device includes a device housing and a printed wiring board, accommodated within the device housing, having a display element mounted thereon. The device housing includes an opening formed at a position corresponding to the display element, a partition wall provided between the opening and the printed wiring board. The partition wall is formed into a tubular shape with the opposite ends thereof opened, and the partition wall has one open end which faces the opening and the other open end which faces the display element.