An apparatus for monitoring the environment of a track-type work machine

An apparatus for monitoring the environment of a track-type work machine includes cameras (61) to (64), which are arranged so as to capture images of an environment of the crawler work machine, a display unit (65) which is so adapted to the indicating with the cameras (61) captured images to (64), and a control device (66) which is so adapted to an outer edge guide image on the basis of the most distant from a rotational center of the track-type work machine position of a sub-carriage on the display unit (65) is generated, hangs up.