Abstract: Provided is a supporter that has an appropriate bending property and is inhibited from excessively bending A supporter (4) includes a base (41), a plurality of grooves (42) that are provided in the width direction of the base (41), fillers (43) that can be respectively inserted into the grooves (42), and disconnection preventing lips (44) for the fillers (43). The fillers (43) each have a small protrusion (49) that extends downward, the base (41) has a through hole (45) or a depression in each of the grooves (42) , and the small protrusion (49) and the through hole (45) can be fitted to each other and freely move to such an extent that they do not separate from each other.

Abstract: When a conventional swivel working vehicle is constructed such that a real part of a swivel body is not extended beyond a traveling device in order to improve an operability at a small site, a balance weight must he significantly increased in weight so as to prevent falling and tumbling of a machine body. In the invention, left and right core metal projections of a crawler are laterally offset from a center line of the crawler and right and left lugs are formed on an outer peripheral surface of the crawler. The lugs are formed to assume the same shape on the right and left sides or laterally symmetrical shapes or occupy the same area on the right and left sides, and to be symmetrically shaped about a center of rotation of the swivel body between the left and right crawlers of the machine body.