To prevent damage of rings in a step of bundling elements with the rings.

In a method for manufacturing a transmission belt, a lot of elements and a plurality of rings are prepared, and the plurality of rings are arranged in a width direction and are fitted in recess parts of the elements to bundle a lot of rows of elements with the plurality of rings. The method for manufacturing a transmission belt includes: a first fitting step of making a ring arranged to one end in the width direction out of the plurality of rings enter into the recess part; a temporary attaching step performed after the first fitting step, and temporarily attaching a protection material to an outer circumferential face of the ring before the ring arranged at the other end in the width direction out of the plurality of rings enters the recess part; a second fitting step of making the ring to which the protection material is attached enter the recess part; and a removing step of removing the protection material from the ring which has entered the recess part.