A crawler with a wear limit indicator, the crawler comprising: a crawler main body; a plurality of sprocket holes formed to pass through a central portion of the crawler main body at equal intervals; a plurality of core metals configured to be inserted and installed in-between the sprocket holes; a plurality of left lugs configured to protrude from one surface of the crawler main body and simultaneously overlap with the sprocket holes and one of the core metals; a plurality of right lugs configured to protrude from the other surface of the crawler main body and simultaneously overlap a pair of adjacent core metals; characterized by: a wear limit indicator configured to protrude from front and rear surfaces of the left lugs and the right lugs and inform that a replacement time for a crawler has come when worn-out surfaces of the left lugs and the right lugs are placed on the same horizontal plane as the wear limit indicator, wherein a foreign substance introduction preventing step configured to prevent foreign substances from being introduced into the sprocket holes is formed to protrude from inner surfaces of the left lugs and the right lugs, and both sides of the foreign substance introduction preventing step is formed to have the same height as that of the wear limit indicator and is integrally connected to the wear limit indicator. a crawler main body; a plurality of sprocket holes formed to pass through a central portion of the crawler main body at equal intervals; a plurality of core metals configured to be inserted and installed in-between the sprocket holes; a plurality of left lugs configured to protrude from one surface of the crawler main body and simultaneously overlap with the sprocket holes and one of the core metals; a plurality of right lugs configured to protrude from the other surface of the crawler main body and simultaneously overlap a pair of adjacent core metals; characterized by: a wear limit indicator configured to protrude from front and rear surfaces of the left lugs and the right lugs and inform that a replacement time for a crawler has come when worn-out surfaces of the left lugs and the right lugs are placed on the same horizontal plane as the wear limit indicator, wherein a foreign substance introduction preventing step configured to prevent foreign substances from being introduced into the sprocket holes is formed to protrude from inner surfaces of the left lugs and the right lugs, and both sides of the foreign substance introduction preventing step is formed to have the same height as that of the wear limit indicator and is integrally connected to the wear limit indicator. a wear limit indicator configured to protrude from front and rear surfaces of the left lugs and the right lugs and inform that a replacement time for a crawler has come when worn-out surfaces of the left lugs and the right lugs are placed on the same horizontal plane as the wear limit indicator, wherein a foreign substance introduction preventing step configured to prevent foreign substances from being introduced into the sprocket holes is formed to protrude from inner surfaces of the left lugs and the right lugs, and both sides of the foreign substance introduction preventing step is formed to have the same height as that of the wear limit indicator and is integrally connected to the wear limit indicator.