The present invention provides a semiconductor device capable of preventing an adhesive for die bonding from flowing to wire bonding area.The semiconductor device of the present invention comprises a semiconductor element 28 having a pair of electrodes, a housing 12 having the recess 14 for accommodating the semiconductor element 28, a first lead electrode 18 and the second lead electrode 20 which are exposed on the bottom of the recess 14, an adhesive layer 30 for die bonding between the semiconductor element 28 and the first lead electrode 18, and electrically conductive wires 32 for wire bonding between one electrode of the pair of electrodes of the semiconductor element and the first lead electrode 18 and between the other electrode and the second lead electrode 20, wherein the housing 12 has the wall 26 formed to extend across the bottom surface of the recess 14 so as to divide the surface of the first lead electrode 18 into a die bonding area 22 and a wire bonding area 24, and the first lead electrode 18 has the notch 36 which is formed by cutting off a portion of an edge of the first lead electrode 18 and located at least just below the wall 26, while the wall 26 and the bottom portion 40 of the housing 12 are connected to each other through the notch 36.