The port, which had been previously announced as standard on the stepped-up 60GB model, allows 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 ports, or HDMI.
Sony also announced that the price of the PS3 in Japan will drop to 49,980 yen ($426), including tax.