A work vehicle comprising: a traveling vehicle body (10, 210) including a pair of left and right front wheels and a pair of left and right rear wheels; a left stepless speed changer device configured to supply power to at least either one of the front wheel and the rear wheel which are disposed on the left side of the traveling vehicle body; a right stepless speed changer device configured to supply power to at least either one of the front wheel and the rear wheel which are disposed on the right side of the traveling vehicle body; a left traveling operational tool for operating driving of at least either one of the front wheel and the rear wheel which are disposed on the left side of the traveling vehicle body; a right traveling operational tool for operating driving of at least either one of the front wheel and the rear wheel which are disposed on the right side of the traveling vehicle body; characterized by a left traveling link configured to mechanically connect the left traveling operational tool with the left stepless speed changer device in order to transmit an operation of the left traveling operational tool to the left stepless speed changer device; a right traveling link configured to mechanically connect the right traveling operational tool with the right stepless speed changer device in order to transmit an operation of the right traveling operational tool to the right stepless speed changer device; a left traveling drive section for driving at least one of the left traveling operational tool and the left traveling link; a right traveling drive section for driving at least one of the right traveling operational tool and the right traveling link; and a traveling control section (120, 263) configured to activate the left traveling drive section in response to receipt of a left traveling instruction for the left traveling operational tool and to activate the right traveling drive section in response to receipt of a right traveling instruction for the right traveling operational tool, in an automatic control mode for automatically controlling the traveling vehicle body. a traveling vehicle body (10, 210) including a pair of left and right front wheels and a pair of left and right rear wheels; a left stepless speed changer device configured to supply power to at least either one of the front wheel and the rear wheel which are disposed on the left side of the traveling vehicle body; a right stepless speed changer device configured to supply power to at least either one of the front wheel and the rear wheel which are disposed on the right side of the traveling vehicle body; a left traveling operational tool for operating driving of at least either one of the front wheel and the rear wheel which are disposed on the left side of the traveling vehicle body; a right traveling operational tool for operating driving of at least either one of the front wheel and the rear wheel which are disposed on the right side of the traveling vehicle body; characterized by a left traveling link configured to mechanically connect the left traveling operational tool with the left stepless speed changer device in order to transmit an operation of the left traveling operational tool to the left stepless speed changer device; a right traveling link configured to mechanically connect the right traveling operational tool with the right stepless speed changer device in order to transmit an operation of the right traveling operational tool to the right stepless speed changer device; a left traveling drive section for driving at least one of the left traveling operational tool and the left traveling link; a right traveling drive section for driving at least one of the right traveling operational tool and the right traveling link; and a traveling control section (120, 263) configured to activate the left traveling drive section in response to receipt of a left traveling instruction for the left traveling operational tool and to activate the right traveling drive section in response to receipt of a right traveling instruction for the right traveling operational tool, in an automatic control mode for automatically controlling the traveling vehicle body.