A portable device enabling a user to visually recognize tampering with internal components. The portable device is for performing wireless communication with a predetermined communication subject and includes a circuit board on which an electronic component is mounted and a case for accommodating the circuit board. The case includes a first case part including a board compartment for accommodating the circuit board and a second case part for covering the circuit board accommodated in the board compartment of the first case part. The first case part and the second case part are joined with each other and unitized in a superimposed state.