A working vehicle comprising: a travelling vehicle; a working part that includes a slewing base turnably provided on an upper side of the travelling vehicle, and is configured to operate with a support of the slewing base; a cab mounted on the slewing base and configured for an operation of the travelling vehicle and the working part; and a coupling part that is configured to couple the cab and the slewing base such that an orientation of the cab is changeable with respect to the slewing base, wherein: the coupling part includes: a coupling part main body that is configured to couple the slewing base and the cab, and is turnable with a first base connecting part connected with the slewing base and a first cab connecting part connected with the cab, and a turning control part extended to intersect the coupling part main body at all times in a turning range of the coupling part main body and to couple the slewing base and the cab, the turning control part being turnable with a second base connecting part connected with the slewing base and a second cab connecting part connected with the cab, a distance between the first base connecting part of the coupling part main body and the second base connecting part of the turning control part and a distance between the first cab connecting part of the coupling part main body and the second cab connecting part of the turning control part are equal to each other, and a length from the first base connecting part to the first cab connecting part in the coupling part main body and a length from the second base connecting part to the second cab connecting part in the turning control part are equal to each other. a travelling vehicle; a working part that includes a slewing base turnably provided on an upper side of the travelling vehicle, and is configured to operate with a support of the slewing base; a cab mounted on the slewing base and configured for an operation of the travelling vehicle and the working part; and a coupling part that is configured to couple the cab and the slewing base such that an orientation of the cab is changeable with respect to the slewing base, wherein: the coupling part includes: a coupling part main body that is configured to couple the slewing base and the cab, and is turnable with a first base connecting part connected with the slewing base and a first cab connecting part connected with the cab, and a turning control part extended to intersect the coupling part main body at all times in a turning range of the coupling part main body and to couple the slewing base and the cab, the turning control part being turnable with a second base connecting part connected with the slewing base and a second cab connecting part connected with the cab, a distance between the first base connecting part of the coupling part main body and the second base connecting part of the turning control part and a distance between the first cab connecting part of the coupling part main body and the second cab connecting part of the turning control part are equal to each other, and a length from the first base connecting part to the first cab connecting part in the coupling part main body and a length from the second base connecting part to the second cab connecting part in the turning control part are equal to each other. the coupling part includes: a coupling part main body that is configured to couple the slewing base and the cab, and is turnable with a first base connecting part connected with the slewing base and a first cab connecting part connected with the cab, and a turning control part extended to intersect the coupling part main body at all times in a turning range of the coupling part main body and to couple the slewing base and the cab, the turning control part being turnable with a second base connecting part connected with the slewing base and a second cab connecting part connected with the cab, a coupling part main body that is configured to couple the slewing base and the cab, and is turnable with a first base connecting part connected with the slewing base and a first cab connecting part connected with the cab, and a turning control part extended to intersect the coupling part main body at all times in a turning range of the coupling part main body and to couple the slewing base and the cab, the turning control part being turnable with a second base connecting part connected with the slewing base and a second cab connecting part connected with the cab, a distance between the first base connecting part of the coupling part main body and the second base connecting part of the turning control part and a distance between the first cab connecting part of the coupling part main body and the second cab connecting part of the turning control part are equal to each other, and a length from the first base connecting part to the first cab connecting part in the coupling part main body and a length from the second base connecting part to the second cab connecting part in the turning control part are equal to each other.