Continuously variable belt transmission

A continuously variable belt transmission comprising:

• a power transmitting member provided on a rotary member, said power transmitting member including a portion movable in an axial direction of said rotary member;
• a belt wound around said power transmitting member;
• a first hydraulic chamber positioned to apply a holding force in said axial direction to said portion of said power transmitting member;
• a second hydraulic chamber positioned to apply a force in said axial direction to said power transmitting member, so as to weaken said holding force;
• a first oil passage provided in said rotary member, through which a hydraulic pressure is supplied to said second hydraulic chamber;
• an oil passage forming member which is mounted to said rotary member, disposed along a path from said first oil passage to said second hydraulic chamber, and provided with a first grooved portion that connects said second hydraulic chamber and said first oil passage, said first grooved portion faces said first oil passage,
• wherein parts attached to said rotary member are disposed on both axial sides of said oil passage forming member.