Abstract: A depth detection apparatus includes: an emitting assembly for emitting a speckle light signal to a detection object, where the emitting assembly is configured to cause the speckle light signal to generate positive distortion; an imaging lens for imaging, to a photoelectric sensor, a depth light signal returned after the speckle light signal strikes the detection object, wherein the imaging lens is configured to cause the imaging of the depth light signal to generate negative distortion; and a photoelectric sensor for converting the depth light signal into an electrical signal, wherein a difference between an absolute value of a distortion amount of the negative distortion and an absolute value of a distortion amount of the positive distortion does not exceed 0.05, and the negative distortion and the positive distortion each are distortion having a distortion amount whose absolute value is greater than or equal to 0.03.