A semiconductor module is provided for shortening a manufacturing tact time, reducing manufacturing costs and for ensuring reliability of a bonding portion. The semiconductor module includes a substrate formed of a metal, an insulating layer formed on the substrate, a plurality of wiring patterns formed on the insulating layer, a bare-chip transistor mounted on one wiring pattern via a solder, and copper connectors that connect electrodes formed on the bear-chip transistor and other wiring patterns via a solder. The copper connectors have a bridge shape, have a width-reduced portion formed in the vicinity of the bonding face to the electrodes, and have a stress-reducing portion formed on the bonding face bonded to the electrode.