1. A keyboard device comprising: a keyboard, key operation detecting means for detecting key operations produced on said keyboard, a coordinate input device arranged near said keyboard and having an operating surface operated by a coordinate indicator, operating state detecting means for detecting an operating state of one of a tap and a slide on said operating surface, screen operating means operative to perform a screen operation in response to information attained from said key operation detecting means and information attained from said operating state detecting means, and control means for inhibiting said screen operation in response to said screen operation operating on said operating screen while said key operation is being detected, wherein said control means includes a processing means operative to initiate inhibiting of processing of said screen operation in response to said key operation being detected by said key operation detecting means and operative to end said inhibiting of said processing after a predetermined time has after said key operation is no longer detected.