a machine body including a lower travelling body that can travel on a ground, and an upper slewing body that is provided on an upper portion of the lower travelling body and can slew about a rotational axis extending in an up-and-down direction;

an angle detector provided to the machine body to detect a relative angle between the lower travelling body and the upper slewing body about the rotational axis;

a travel lever that receives a manipulation for making the lower travelling body travel;

a display disposed within an eyesight of a worker;

a directional information generator that generates directional information related to a travelling direction of the lower travelling body relative to the upper slewing body based on at least a detected result of the angle detector; and

a display controller that controls the display to display a directional information image indicating the directional information on the display when the travel lever receives the manipulation, and not to display the directional information image on the display when the travel lever does not receive the manipulation,

wherein:

the lower travelling body starts travelling when a manipulation magnitude of the manipulation received by the travel lever exceeds a first threshold value which is greater than zero,

the construction machine further comprises a manipulation magnitude detector that detects the manipulation magnitude received by the travel lever, and

the display controller makes the display the directional information image when the manipulation magnitude of the travel lever detected by the manipulation magnitude detector is equal to or greater than a second threshold value greater than zero and smaller than the first threshold value,

the travel lever, the display, the directional information generator, and the display controller are provided in an operating region placed outside the machine body,

the construction machine further comprises at least one image capturing device that is provided to the upper slewing body to be oriented to a predetermined image capturing direction and captures an image of a sight seen from the upper slewing body, a transmitter that is provided to the machine body and transmits a sight image captured by the at least one image capturing device and the detected result of the angle detector to the operating region, and a receiving device that is provided in the operating region and receives the sight image and the detected result of the angle detector transmitted from the transmitter, and

the display controller makes the display the sight image, and makes the display superpose the directional information image on the sight image when the manipulation magnitude of the travel lever becomes equal to or greater than the second threshold value, but not superpose the directional information image on the sight image when the manipulation magnitude of the travel lever is smaller than the second threshold value.