The invention provides a toroidal continuously variable transmission mechanism capable of preventing tensile load in an axial direction from working on an input shaft of the toroidal continuously variable transmission mechanism. The toroidal continuously variable transmission mechanism (T) includes: a force-applying device for applying a force to an input disc (14) in a direction in which the input disc becomes closer to an output disc (15) to press the input disc and the output disc against power rollers (18); a first bearing (26A) for supporting an input shaft (13) on the input disc side; a second bearing (26B) for supporting the output disc; a first support member (45) whose one end side is fixed to a base member (41), and which supports the first bearing; a second support member (46) whose one end side is fixed to the base member, and which supports the second bearing; and a connecting member (49) which connects opposite end sides of the first and second support members. Reaction forces (FL1, FR1) are transmitted to the input disc and the output disc from the power rollers, and are supported by internal stresses (FL2', FR2') of the base member and the connecting member.