A lead frame having a die pad of such a shape that prevents scattering of solder to lead when a chip is mounted on the lead frame, and a semiconductor device using such a lead frame are provided. The lead frame includes a die pad having a region surrounded by a first side, a second side opposing to the first side, a third side different from the first and second sides, and a fourth side opposing to the third side, and a lead formed of a conductor and electrically connected to a semiconductor element. The die pad includes a notch extending along the first and the second sides and positioned opposing to a main surface of the semiconductor element, and a through hole extending along the third and fourth sides and positioned opposing to the main surface of the semiconductor element. The semiconductor device employs the die pad.