A semiconductor device with its package size close to its chip size has a stress absorbing layer, allows a patterned flexible substrate to be omitted, and allows a plurality of components to be fabricated simultaneously. There is: a step of forming electrodes on a wafer; a step of providing a resin later as a stress relieving layer on the wafer, avoiding the electrodes; a step of forming a chromium layer as wiring from electrodes over the resin layer; and step of forming solder balls as external electrodes on the chromium layer over the resin layer; and a step of cutting the wafer into individual semiconductor chips; in the steps of forming the chromium layer and solder balls, metal thin film fabrication technology is used during the wafer process.