Microfluidic device and a manufacturing method thereof, the passage forming a photosensitive resin composition for

Having without fear and small flow channels to substrate adhesion of, and an object thereof is to provide a microfluidic device. Pattern A microfluidic device having an internal flow path member, the flow path, a compound having an oxiranyl group, is formed from a compound having an oxetanyl group, and a photosensitive resin composition containing the photoacid generator microfluidic device characterized in that it comprises a phased resin composition layer.