Lenovo Group Ltd, on track to become the world's top maker of personal computers, reported a record quarterly profit, up 33.5 percent from a year earlier, as it gained more share in the PC market and made inroads in the smartphone business.

The ThinkPad maker, also China's No. 2 smartphone vendor, said on Wednesday net profit in its October-December third quarter had risen to $204.9 million, above the average estimate of $178.4 million in a Thomson Reuters I/B/E/S poll of 11 analysts.

Lenovo has rapidly gained market share in the PC sector on the back of acquisitions over the past few years. The company trails Hewlett Packard Co by a slim margin in PC shipments, according to technology research group IDC.

As PC demand growth slows, Lenovo has been diversifying into the mobile device sector to tap robust demand for smartphones and tablets, particularly at home in China, the world's biggest market for mobile phones and personal computers.

(Reporting by Lee Chyen Yee; Editing by Chris Gallagher)