Polymer optical waveguide and method for production thereof

A method of producing a polymer optical waveguide, comprising:

• preparing a multilayer sheet in which a first layer serving as a first cladding, a second layer serving as a core and having a refractive index greater than that of the first layer, and a third layer serving as a second cladding and having a refractive index less than that of the second layer, are stacked in this order, and in which a metal layer is stacked on at least one of the first layer or the third layer;
• cutting the multilayer sheet in a thickness direction thereof from the metal layer side using a first blade to form a first groove that partitions the metal layer, to thereby form a conductive wire;
• and
• cutting at least a part of the base of the first groove in the thickness direction using a second blade to form at least one second groove, to thereby form one of lateral surfaces of the core.