Push and rotary operating type electronic device and a communication terminal apparatus using the apparatus

A push and rotary operating type electronic device and a communication terminal apparatus using the device, the structure of the electronic device constituting the push switch portion (37) is configured around it at the center of the housing bottom (30) of the rotary encoder portion (35), while in turn the disk-shaped operating knob (39) mounted to be rotatable together with the rotary encoder (35), while moving up and down independently of the operating knob (39) to a rotating operation of the outer periphery an operation portion, and the pressing operation will press the central portion and two members (35) and (37) operation. Small projected area of ​​the structure, and can be rotated, and a pressing operation of the operation knob (39) in different operating positions.