A portable terminal device includes a first body having an operation section on a main surface thereof, a second body having a display section on a main surface thereof, a connection device for connecting the first body and the second body so that the portable terminal device is openable and closable, a memory storage section having an opening section openable to another main surface of the second body, a lid for opening and closing the opening section and retaining a removable memory in the memory storage section, wherein the operation section is covered by the second body when the portable terminal device is in a closed state, and is exposed to the outside when the portable terminal device is in an open state, and the display section is exposed to the outside in either the closed or opened state.