Abstract: An apparatus and a method for detecting a mounting state of a light pipe in a terminal are disclosed. The detection apparatus includes a fixture, a detection light source, and a light detection module. A light inlet path is formed inside the fixture, an opening that is of the light inlet path and that is exposed to the fixture is opposite to a mounting position of the light pipe, and the detection light source is disposed above the fixture. The light detection module is configured to determine the mounting state of the light pipe based on a luminous flux value of detection light. In cases in which the light pipe is properly mounted, the mounting position is deviated, the light pipe is not mounted, or the like, the luminous flux value of the detection light that is transmitted to the light detection module through the light inlet path varies accordingly.