in the case of the high strength brass in case where the optimum composition is selected there can be obtained a retainer which is excellent in fatigue strength in the case of the high strength brass its hardness lowers as its u03b1 phase decreases fig4 on the other hand the fatigue strength of the high strength brass increases greatly in case where its u03b1 phase exceeds 40 fig5 this disagrees with the tendency of ordinary steel material in which the fatigue strength increases as the hardness increases the reason why the high strength brass provides the above tendencies seems that the high strength has a two phase structure composed of u03b1 phase and u03b2 phase for the power roller of a toroidal type continuously variable transmission from the viewpoint of the fatigue strength the u03b1 phase is required to be 40 or more and from the viewpoint of the material strength the hardness is required to be hb80 or higher also preferably the u03b1 phase may be set in the range of 40 to 80 in case where the above mentioned high strength brass is used as the material of the power roller retainer there can be obtained a toroidal type continuously variable transmission which can prevent the retainer against damage and can enjoy a long life now description will be given below of the embodiments of the invention by the way the basic structure of a toroidal type continuously variable transmission according to the invention is similar to that shown in fig1 but the present.