Morio Kita was born as the second son of Mokichi Saito, a great Tanka poet, and his wife Teruko. He grew up in a wealthy family, received college education to become a medical doctor after some turns and twists, and then entered his career as a writer. He won Akutagawa Prize at an early stage of his writer career and continued to produce numerous works thereafter. His works are rich in humor, which attracted a great number of readers.In this paper the author attempted to analyze his works and search for roots of his humor. Humorous features of his works were characterized and categorized in the last chapter. It seems clear that his sense of humor was nurtured by his lifelong self-education driven by his intellectual enthusiasm.