A superior portable information terminal of the palm size having a keyboard unit wherein the portable information terminal includes a polyhedral structure having a number of component faces including a first component face which accommodates a display screen and a second component face provided adjacent the first component face and having an inputting key set including a number of key tops arranged in a zigzag pattern. Each of the key tops has a rib-like projection formed along a peripheral edge thereof. In an operation condition wherein a user holds the portable information terminal with one hand and observes the display screen, the user can perform key inputting operation using the fingertips of the hand with which the body of the apparatus is held. Further, the user can search for the location of any key through the sense of touch on the rib-like projection or projections obtained from a fingertip.
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