To improve rigidity of an input shaft of a four-bar linkage mechanism type continuously variable transmission.

This four-bar linkage mechanism type continuously variable transmission 1 comprises: an input shaft 2; an output shaft 3; six rotation radius adjustment mechanisms 4; rocking links 18 provided at the output shaft 3 via a one-way clutch 17; connecting rods 5 connecting the rotation radius adjustment mechanisms 4 and the rocking links 18; and pinions 7. Each rotation radius adjustment mechanism 4 comprises a cam disk 5 eccentrically fixed to the input shaft 2 and a rotary disk 6 rotatably and axially supported by the cam disk 5. Each rotary disk 6 is provided with a pair of internal teeth 6b so as to hold the cam disk 5 therebetween in the axial direction. The pinion 7 is rotatably and axially supported by the input shaft 2, and arranged between the cam disks 5. One pinion 7 is meshed with each of the internal teeth 6b of the two adjacent rotary disks 6.