PORTABLE TERMINAL

A mobile terminal device includes a main body and a touch panel, formed on the main body, on which an operating button is provided, the mobile terminal device being characterized in that when a specific condition which will cause the main body to vibrate is established, at least one of a size of the operating button on the touch panel, a size of character or symbol given on the operating button, a color or luminance of the operating button, and a response voice when the operating button is manipulated is changed.