A traction transmission capacity control device used for a power transmission apparatus that is configured to perform power transmission through the use of traction transmission obtained by radial-direction mutual pressing contact between a first roller and a second roller, in which a traction transmission capacity of the power transmission apparatus is controlled as a result of second-roller revolving means (45,51R,51L,51Rc,51Lc,55)being configured to control a radial-direction mutual pressing force exerted between the first roller and the second roller, the second-roller revolving means(45,51R,51L,51Rc,51Lc,55) being configured to revolve the second roller around an eccentric axis offset from a rotational axis of the second roller, the traction transmission capacity control device comprising: at least one of revolution torque detecting means configured to cause the second-roller revolving means(45,51R,51L,51Rc,51Lc,55) to revolve the second roller and to detect revolution torque of the second roller during the revolution of the second roller, and revolution speed detecting means configured to cause the second-roller revolving means(45, 51R,51L,51Rc,51Lc,55) to revolve the second roller and to detect a revolution speed of the second roller during the revolution of the second roller; characterized by the traction transmission capacity control device further comprising a singular-point detecting means configured to detect a singular point ((a), (b), (c), (d); (e), (f), (g), (h); (a), (b), (c), (d), (e), (f), (g), (h)) concerning a singular time-series change of at least one of the revolution torque and the revolution speed of the second roller detected by the revolution torque detecting means and the revolution speed detecting means, respectively; and second-roller revolution operation reference point setting means configured to seta revolution operation reference point of the second roller on the basis of the singular point detected by the singular-point detecting means, wherein the revolution operation reference point of the second roller set by the second-roller revolution operation reference point setting means is used for performing the traction transmission capacity control. at least one of revolution torque detecting means configured to cause the second-roller revolving means(45,51R,51L,51Rc,51Lc,55) to revolve the second roller and to detect revolution torque of the second roller during the revolution of the second roller, and revolution speed detecting means configured to cause the second-roller revolving means(45, 51R,51L,51Rc,51Lc,55) to revolve the second roller and to detect a revolution speed of the second roller during the revolution of the second roller; characterized by the traction transmission capacity control device further comprising a singular-point detecting means configured to detect a singular point ((a), (b), (c), (d); (e), (f), (g), (h); (a), (b), (c), (d), (e), (f), (g), (h)) concerning a singular time-series change of at least one of the revolution torque and the revolution speed of the second roller detected by the revolution torque detecting means and the revolution speed detecting means, respectively; and second-roller revolution operation reference point setting means configured to seta revolution operation reference point of the second roller on the basis of the singular point detected by the singular-point detecting means, wherein the revolution operation reference point of the second roller set by the second-roller revolution operation reference point setting means is used for performing the traction transmission capacity control.