The port, which had been previously announced as standard on the stepped-up 60GB model, enables games to be played in full high-definition video and audio.
The company said its decision was made in part by the "sharp increase" in flat-panel televisions now sold with High-Definition Multimedia Interface, or HDMI, ports.
Sony also announced that the price of the PS3 in Japan will drop to 49,980 yen ($426), including tax.
After several delays, Sony has said it will release the PS3 on Nov. 11 in Japan and Nov. 17 in the United States, two days before rival Nintendo plans to release its next-generation game console, the Wii.
In the U.S. market, the 20GB model of the PS3 will cost $499, and the stepped-up 60GB version will cost $599. Both versions will have a Blu-ray Disc optical drive inside. Xbox 360 owners will soon be able to purchase an external HD DVD drive, Blu-ray's opposing format in the next-generation high-definition video race.
