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.