Abstract: A portable information terminal includes a body casing which incorporates a function unit for transmitting and receiving information and has a groove portion with a plane bottom, and a card casing which is reversibly and slidably attached in the plane-bottom groove portion of the body casing and has an operation unit. The plane-bottom groove portion of the body casing has a rectangular shape with side surfaces opposed to each other and a pair of guide grooves formed on the opposed surfaces thereof. The card casing has a rectangular shape substantially similar to that of the plane-bottom groove portion and has a pair of pins near the end portions of the opposed side surfaces. The card casing is attached to the body casing by inserting the pair of pins into the pair of guide grooves.

Abstract: A portable information terminal includes a body casing which incorporates a function unit for transmitting and receiving information and has a groove portion with a plane bottom, and a card casing which is reversibly and slidably attached in the plane-bottom groove portion of the body casing and has an operation unit. The plane-bottom groove portion of the body casing has a rectangular shape with side surfaces opposed to each other and a pair of guide grooves are formed on the opposed surfaces thereof. The card casing has a rectangular shape substantially similar to that of the plane-bottom groove portion and has a pair of pins near the end portions of the opposed side surfaces. The card casing is attached to the body casing by inserting the pair of pins into the pair of guide grooves.