The article describes the model of the genre of “judicial expert opinion” and considers a medical expert opinion as its example. A judicial expert opinion is defined as a written text including the research and conclusions on the issues posed to the expert by the person conducting the criminal proceedings, or by the defense or prosecution. This text functions simultaneously in two branches: in jurisprudence, as a document, and in a certain field of science that is related to the field of expert knowledge, in this case in medicine.