Eliot said "the general point of view may be described as classicist in literature, royalist in politics, and anglo-catholic in religion" in the preface to For Lancelot Andrewes. He was converted to Anglo-Catholicism in 1927. His declaration of viewpoints aroused many comments, for though he had been a unitarian, most readers and critics had believed that he had been interested in Eastern thoughts or unconcerned with religion, as is shown in his poetry. He, therefore, explained why he said so. But his explanation does not suffice to make us believe his reason of conversion. I tried to examine the causes of his conversion to Anglo-Catholicism through his prose and general attitude in his poetry. First, he showed much interest in such Eastern thoughts as Buddhism and Hinduism since he was a student of Harvard`s graduate school. His interest in Buddhism began somewhat earlier. He was on the verge of becoming a Buddhist when he was writing The Waste Land, as Partridge and Spender witnessed. The Waste Land contains much of Buddhistic and Hindu elements, not to say that its ending is one of the formal closing phrase of Upanishad, a kind of Hindu scripture. He avowed there remained much of the influence of early Buddhist scripture in his poetry. It is, therefore, very difficult to think of his declaration of conversion as a candid confession. Second, we can surmise that the hardship of living would have made him to accept Anglo-Catholicism. After he married and settled down in London he lived a very hard life, because he could not earn enough money by teaching in the day and public speaking at night. Moreover his wife Vivienne was taken ill just after they were married and suffered a serious illness in the winter of 1927 and 1925. At first he determined to divorce but he accepted the marriage as a doom. He couldn`t publish any important works since The Waste Land. We can think that he took refuge in Angle-Catholicism, that is to say, he wanted to take advantage of the power, order and organization of the church, and he felt some attraction to the intellectual and artistic tradition of the church. Third, his friendship lead him to join in Anglo-Catholicism. His wife Vivienne was a born Anglo-Catholic, and one of his friends, William Force Stead, was a priest. One of his life-long friends, Robert Sencourt had a similar interest in Eastern thoughts, but was an Anglo-Catholic. He introduced Eliot to Francis Underhill, Who later became a Bishop of Bath and Wells. We can guess these friendships influenced him to make up his mind to follow the life of high sanctity and service, for he thought that was a way to a new life. Fourth, because he had settled down in England he wanted to observe the tradition of his ancestors. He thought the tradition and orthodox of England was Anglo-Catholicism. He wanted to succeed socially by following the tradition and orthodox and one way to become a success in England was to become an Anglo-Catholic. We can, therefore, suppose it was an act of compromise with the society. Fifth, the Anglo-Catholic church is an established church in England. In England Anglo-Catholicism is supported by the nation socially and organizationally, so it would be very difficult to diminish to a sect. When Eliot chose his religion, he must have taken this into account. We can say that he chose the church which seemed to remain as the powerful church in England. As we surveyed, Eliot`s conversion to Anglo-Catholicism was caused by many reasons, except for his belief in God. Perhaps it was certain he was attracted to Anglo-Catholicism emotionally. But as he was an intelligent man, he must have taken other things into account when he decided to join the church. It would not be too excessive to say that his conversion was a strategic action caused by some realistic factors, included with his belief in God.