The present invention enables quick creation and modification of a circuit pattern by exposing the circuit pattern to light on a substrate without using a photomask having the circuit pattern formed therein. A circuit pattern manufacturing device is provided with a forming means for forming a circuit pattern by irradiating a circuit pattern forming sheet with a beam of light, the circuit pattern forming sheet having an insulating sheet base-material layer and a mixture layer comprising a mixture including an electrically conductive material and a photo-curable resin. The forming means, as an optical engine, is provided with a housing, a laser diode, a prism mirror, an inclined mirror, a bottom surface mirror, and a drive mirror.
