Provided is a semiconductor device having a wiring structure on a semiconductor element and capable of securing high quality and high reliability in response to the desire for high-temperature operations, a large-current specification, thinner wafers, smaller device size, and reduced loss. A semiconductor device that includes an insulating circuit board; a semiconductor element implemented on the insulating circuit board; a first insulating resin layer laminated on the insulating circuit board; a copper-plated wiring which contacts the semiconductor element via a window portion formed in the first insulating resin layer, which enables contact with the semiconductor element; and a second insulating resin layer laminated so as to seal the copper-plated wiring, and a method for producing the semiconductor device are provided.