Toyota posted a 35 per cent rise in operating profit to $4.19 billion for the six months through September, and sales rose 6 per cent to $6.24 billion.
Net profit surged 82 per cent to $2.7 billion. The world's third-largest automaker had been saddled last year with a large extraordinary loss it took to cover a shortfall in its pension funds.
Toyota executive vice-president Mr Ryuji Araki expressed confidence about Toyota's full-year outlook in the United States.
The US market had been a worry after the September 11th attacks, but sales figures have boomed thanks to zero-interest and low-interest financing offered by automakers.
But the outlook for Toyota's stock remains cloudy, despite potential record profit levels this business year and progress in regaining ground after initial share-price volatility following the September 11th attacks.
But, compared to main rival Honda Motor, Toyota's growth was less eye-catching.
Honda, which has dominated the domestic market this year with a slew of minivans and its hot-selling Fit subcompact, reported a 57 per cent rise in first-half operating profit to $2.9 billion, with an operating margin of 9 per cent.
Toyota's operating margin was 7.4 per cent. For the first half, Toyota posted group vehicle sales of 2.69 million units, up 1.4 per cent from the previous year.