A work vehicle, comprising: an engine; a drive unit configured to be driven by means of driving force from the engine for causing the work vehicle to travel; a hydraulic pump configured to be driven by means of the driving force from the engine for discharging hydraulic oil; a work instrument configured to be driven by means of the hydraulic oil from the hydraulic pump; a work instrument load detecting part configured to detect a work instrument load information regarding to a load of the work instrument; a torque converter unit including a torque converter and a lock-up clutch, characterised in that the lock-up clutch is configured to be switched among a coupled state, a slippage state and a decoupled state in accordance with a lock-up hydraulic pressure indicating a pressure of the hydraulic oil to be supplied thereto, the torque converter unit configured to transmit the driving force from the engine to the drive unit through either the torque converter or the lock-up clutch; and a control unit is configured to control the lock-up hydraulic pressure for switching the lock-up clutch, the control unit configured to execute a lock-up slippage control for switching the lock-up clutch into the slippage state when the work vehicle starts moving, the control unit configured to control the lock-up hydraulic pressure based on the work instrument load information during execution of the lock-up slippage control, and the control unit is configured to set a target engine speed for the engine and modify the target engine speed based on the work instrument load information during execution of the lock-up slippage control. an engine; a drive unit configured to be driven by means of driving force from the engine for causing the work vehicle to travel; a hydraulic pump configured to be driven by means of the driving force from the engine for discharging hydraulic oil; a work instrument configured to be driven by means of the hydraulic oil from the hydraulic pump; a work instrument load detecting part configured to detect a work instrument load information regarding to a load of the work instrument; a torque converter unit including a torque converter and a lock-up clutch, characterised in that the lock-up clutch is configured to be switched among a coupled state, a slippage state and a decoupled state in accordance with a lock-up hydraulic pressure indicating a pressure of the hydraulic oil to be supplied thereto, the torque converter unit configured to transmit the driving force from the engine to the drive unit through either the torque converter or the lock-up clutch; and a control unit is configured to control the lock-up hydraulic pressure for switching the lock-up clutch, the control unit configured to execute a lock-up slippage control for switching the lock-up clutch into the slippage state when the work vehicle starts moving, the control unit configured to control the lock-up hydraulic pressure based on the work instrument load information during execution of the lock-up slippage control, and the control unit is configured to set a target engine speed for the engine and modify the target engine speed based on the work instrument load information during execution of the lock-up slippage control.