a portable electronic device has a main body , a display part having a display panel , and a connection part having a first rotary part respectively connected to and rotatably interconnecting a second rotary part and supporting the main body and the display part relatively to each other . the first rotary part maintains a fixed angular relationship between the main body and the connection part and permits adjustment of the angle therebetween when a first rotary manipulation force is applied therebetween which exceeds a rotary manipulation force due to the weight of the main body itself . the second rotary part maintains a fixed angular relationship between the main body and the connection part and permits adjustment of the angle between the display part and the connector when a second rotary manipulation force is applied therebetween which exceeds a rotary manipulation force due to the weight of the main body itself .