To provide a high load transmission belt capable of preventing wear of a center belt, reducing breakdown due to breakage of the belt, reducing generated heat, preventing degrading of resin materials constructing a block, and when forming the center belt, forming recesses and protrusions in a shape and height as per the predetermined design so that a canvas is laid to fit a die.

The high load transmission belt 1 has the center belt 3 with at least one side subjected to adhesive treatment, and is covered by a cover canvas 10 having aramid fibers as a constructing component. The cover canvas 10 being used is one with the width after the adhesive treatment shrunk to 40 to 63% compared to before being subjected to adhesive treatment.