Crawler type working machine of the environment monitoring device

Periphery monitoring device of the crawler type working machine includes a camera (61) - (64) for imaging the surroundings, a camera (61) - display means for displaying an image captured by the (64) (65), said display means to (65), and a control means (66) for superimposing the outer guide image formed based on the most distant position of the lower traveling body from the turning center of the crawler type working machine.