An object is to provide a fiber-reinforced resin that can be welded to another member via a thermoplastic resin and that is less likely to be damaged even when welded at a high temperature, wherein the fiber-reinforced resin includes a reinforcing fiber and has a cured epoxy resin region and a thermoplastic resin region disposed at the surface wherein aromatic rings account for 50% or more and 90% or less of the cured epoxy resin present in the cured epoxy resin region.