Steve Ballmer told the BBC: "Is it fair to say we're going to do more hardware? Obviously we are... Where we see important opportunities to set a new standard, yeah we'll dive in."
The chief executive's comments came ahead of a Windows 8 launch event in New York, following which Microsoft's Surface tablet will go on sale.
News other devices are likely to follow may worry some of the firm's partners.
Mr Ballmer caused a stir when he revealed in June that his company was making its own family of tablet computers