The object of the present invention provides the housing structure of a portable telephone device in a portable terminal, which enables utilization of the functions of a portable wireless terminal in the integrated state of the portable wireless terminal to the portable terminal. The housing structure houses, in portable terminal 101, the portable wireless terminal that includes first casing 26 and a functional unit configured to perform a predetermined function in an exposed state. Portable terminal 101 includes second casing 110 having a first face and a second face which is adjacent to the first face and in which opening 112 is formed to enable insertion or removal of the portable wireless terminal. Housing unit 111 is formed in second casing 110 to house and fix the portable wireless terminal inserted through opening 112. Opening 112 is continuously formed from the second face to the first face to expose the functional unit in the inserted state of the portable wireless terminal, and the depth of housing unit 111 is equal to the length of first casing 26 or deeper than the length of first casing 26.