Resin-sealed semiconductor device

A resin-sealed semiconductor device, comprising:

• a die pad portion for mounting a semiconductor element thereon;
• a semiconductor element mounted on the die pad portion and having electrodes;
• a plurality of lead portions arranged with their respective tips facing the die pad portion;
• thin metal wires for connecting the electrodes of the semiconductor element to the lead portions;
• and
• a sealing resin for sealing the die pad portion, the semiconductor element, the lead portions and connection regions of the thin metal wires except a bottom surface of the die pad portion and respective bottom surfaces and terminal ends of the lead portions, wherein
• the terminal ends of the lead portions are approximately flush with a side surface of the sealing resin, and
• the die pad portion has a first recess formed in an outer periphery of the bottom surface thereof, an upward projecting support portion for supporting the semiconductor element, and a second recess provided at a region of the bottom surface of the die pad portion that corresponds to the support portion, with the first recess formed at the bottom surface of the die pad portion being a groove-like recess extending from an outer end of the bottom surface of the die pad portion to the second recess.