Embodiments of the present invention provide a three-dimensional camera assembly, a terminal apparatus and a ranging method. The three-dimensional camera assembly comprises: a substrate; a first camera and a second camera, mounted on the substrate and facing a first direction, wherein first and second optical axes of the first and second cameras are oblique with respect to a connection line between lens centers of the first and second cameras, the first optical axis has a first included angle with respect to the connection line, the second optical axis has a second included angle with respect to the connection line, and at least one of the first included angle and the second included angle is not 90°.