Psychoanalysis is the study of human's behavior and personality. It is one of the scientific disciplines developed by Sigmund Freud. It appears to scrutinize deeper of human personality and shows that each human has different personalities. The tripartite psyche refers to id, ego, and superego. It exists to construct human’s personality based on their experiences. The role of id, ego, and superego are to maintain or balance human’s behavior, specifically the desires, reality act, and morality. This thesis discusses about the tripartite role of the psyche in the main character in John Grisham’s The Innocent Man: Murder and Injustice in a Small Town novel named Ron Williamson. The purpose of this thesis is to investigate Ron Williamson’s tripartite psyche portrayed in the novel. The researcher used qualitative research methodology and psychoanalysis approach. The results of this thesis are Ron Williamson, as the main character is a unique character. The Id of him depicted in the novel are illogical, immoral, uncontrollable, unethical, troublemaker, selfish, drunk, childish, insolent, excessive, erratic, unpredictable, hallucination, disoriented, mood swings, uncertain, delusional, confused, and detached from reality. On the other hand, the ego of Ron Williamson is worried, regretful, reduce the selfishness, responsible, aware of his surroundings, unconfused, reduced the troublemaker, honest, patience, and rational thinking. The last is superego of Ron Williamson are polite, good attitudes, servant of God, sympathetic, stable behavior, intelligent, more sensible thinking, more responsive to his surroundings, devout Christian, quit from troublemaker, break out from selfishness and self-absorbed, and forgiving. Furthermore, the findings show that those depictions are from conflicts to other minor characters, self-conflict, direct description from the author, dialogues, and events in each chapter.

Key words: Psychoanalysis, Sigmund Freud, Tripartite Psyche