Suspension board with circuit

A suspension board with circuit comprising:

• a circuit board comprising a metal supporting board, an insulating layer formed on the metal supporting board, and a conductive layer formed on the insulating layer;
• and
• an optical waveguide provided in the circuit board;
• wherein the optical waveguide comprises:
• a first optical waveguide including a curved portion, and a secondary optical waveguide including a linear portion;
• wherein the first optical waveguide comprises:
• a first under clad layer, and
• a first core layer formed on the first under clad layer and included in the first under clad layer when projected in the thickness direction of the first under clad layer, and
• a first over clad layer formed on the first under clad layer to cover the first core layer;
• wherein the secondary optical waveguide comprises:
• a secondary under clad layer, and
• a secondary core layer formed on the secondary under clad layer, and
• a secondary over clad layer formed on the secondary core layer and included in the secondary core layer when projected in the thickness direction of the secondary core layer;
• and
• wherein the circuit board is provided with a slider mounting portion including a mounting portion as a region for mounting a head slider, and
• wherein at least a part of the secondary optical waveguide is arranged in the slider mounting portion.