SWING OPERATION VEHICLE

A swivel body (2) is mounted horizontally swivelably on a traveling device (1) and provided thereon with a hydraulically-operated working system (7). Assuming that a side end of the swivel body where the hydraulically-operated working system is provided serves as a front end of the swivel body, an engine (23) is disposed in a rear portion of the swivel body and covered with a bonnet (14). A hydraulic oil tank (43) for the hydraulically-operated working system is disposed below the lower end of the bonnet along one of the left and right side ends of the swivel body so that the longitudinal direction of the hydraulic oil tank agrees with the fore-and-aft direction of the swivel body. A radiator (38) is disposed upward on the hydraulic oil tank. A fuel tank (45), a battery (55) and a hydraulic actuator (23) for swinging the hydraulically-operated working system are disposed along the other of the left and right side ends of the swivel body. The battery, the radiator and a part of the fuel tank are disposed within the bonnet so as to be stored within full lengths of the engine in the fore-and-aft direction and the left-and-right direction.