a toroidal - type continuously variable transmission has a casing , a rotation shaft , a pair of outer side disks having side surface , supported on the rotation shaft , and rotating in synchronism with the rotation shaft , an inner side disk having two side surfaces , rotatably supported on around a middle portion of the rotation shaft , and rotating relative to the rotation shaft , pluralities of supporting members disposed between the both side surfaces of the inner side disk and the side surfaces of the outer side disks , respectively , and swinging on a pivot shaft disposed so as to be twisted to the rotation shaft , and pluralities of power rollers rotatably supported on the respective supporting members , wherein an outer peripheral face of the inner side disk is provided with a detected portion for detecting rotation of the inner side disk .