A crane, comprising: a first adjustment valve; a second adjustment valve; and a hydraulic motor used for a swivel operation, the first adjustment valve being freely adjustable in a flow rate of hydraulic fluid to be delivered to the hydraulic motor, the second adjustment valve being freely adjustable in a flow rate of hydraulic fluid returned from the hydraulic motor, the crane further comprising: a controller capable of controlling the first adjustment valve and the second adjustment valve; a main operation tool allowing for inputting an instruction pertaining to the swivel operation into the controller; and a sub-operation tool allowing for inputting an instruction pertaining to the swivel operation into the controller, characterized in that the crane comprises: a switch for the operator to select one of the first mode, the second mode, and the third mode, wherein in the first mode, the first adjustment valve and the second adjustment valve are actuated based only on an operation of the main operation tool, in the second mode, the first adjustment valve is actuated based only on an operation of the main operation tool, and the second adjustment valve is actuated based only on an operation of the sub-operation tool, and in the third mode, the first adjustment valve is actuated based only on an operation of the main operation tool, and the second adjustment valve is actuated based on an operation of the main operation tool while being also actuated based on an operation of the sub-operation tool. a first adjustment valve; a second adjustment valve; and a hydraulic motor used for a swivel operation, the first adjustment valve being freely adjustable in a flow rate of hydraulic fluid to be delivered to the hydraulic motor, the second adjustment valve being freely adjustable in a flow rate of hydraulic fluid returned from the hydraulic motor, the crane further comprising: a controller capable of controlling the first adjustment valve and the second adjustment valve; a main operation tool allowing for inputting an instruction pertaining to the swivel operation into the controller; and a sub-operation tool allowing for inputting an instruction pertaining to the swivel operation into the controller, characterized in that the crane comprises: a switch for the operator to select one of the first mode, the second mode, and the third mode, a controller capable of controlling the first adjustment valve and the second adjustment valve; a main operation tool allowing for inputting an instruction pertaining to the swivel operation into the controller; and a sub-operation tool allowing for inputting an instruction pertaining to the swivel operation into the controller, characterized in that the crane comprises: a switch for the operator to select one of the first mode, the second mode, and the third mode, wherein in the first mode, the first adjustment valve and the second adjustment valve are actuated based only on an operation of the main operation tool, in the second mode, the first adjustment valve is actuated based only on an operation of the main operation tool, and the second adjustment valve is actuated based only on an operation of the sub-operation tool, and in the third mode, the first adjustment valve is actuated based only on an operation of the main operation tool, and the second adjustment valve is actuated based on an operation of the main operation tool while being also actuated based on an operation of the sub-operation tool.