A working vehicle having a damper operation control device, comprising: a boom pivotably supported on a vehicle body; a bucket pivotably supported on a tip end of the boom; a lift cylinder which drives the boom; an accumulator connectable to the lift cylinder through a branched oil passage; a switching valve connected to the branched oil passage between the lift cylinder and the accumulator, the switching valve being adapted to switch between a connected state and a disconnected state between the lift cylinder and the accumulator; a controller adapted to perform switch control of the switching valve, wherein the working vehicle further includes a transmission for driving, and the controller includes: a state detecting unit adapted to detect whether the bucket is in a loaded state based on at least one of the bottom pressure of the lift cylinder, the attitude angle of the boom, the direction of the bucket, and a shift operation signal for operating the transmission; and a switching valve control unit, characterized in that the switching valve control unit is adapted to switch the switching valve to the connected state when the working vehicle travels at a speed not lower than a predetermined speed when the state detecting unit detects that the bucket is in a state other than the loaded state, and the switching valve control unit is adapted to switch the switching valve to the connected state even when the working vehicle travels at a speed lower than the predetermined speed when the state detecting unit detects that the bucket is in the loaded state. a boom pivotably supported on a vehicle body; a bucket pivotably supported on a tip end of the boom; a lift cylinder which drives the boom; an accumulator connectable to the lift cylinder through a branched oil passage; a switching valve connected to the branched oil passage between the lift cylinder and the accumulator, the switching valve being adapted to switch between a connected state and a disconnected state between the lift cylinder and the accumulator; a controller adapted to perform switch control of the switching valve, wherein the working vehicle further includes a transmission for driving, and the controller includes: a state detecting unit adapted to detect whether the bucket is in a loaded state based on at least one of the bottom pressure of the lift cylinder, the attitude angle of the boom, the direction of the bucket, and a shift operation signal for operating the transmission; and a switching valve control unit, characterized in that a state detecting unit adapted to detect whether the bucket is in a loaded state based on at least one of the bottom pressure of the lift cylinder, the attitude angle of the boom, the direction of the bucket, and a shift operation signal for operating the transmission; and a switching valve control unit, characterized in that the switching valve control unit is adapted to switch the switching valve to the connected state when the working vehicle travels at a speed not lower than a predetermined speed when the state detecting unit detects that the bucket is in a state other than the loaded state, and the switching valve control unit is adapted to switch the switching valve to the connected state even when the working vehicle travels at a speed lower than the predetermined speed when the state detecting unit detects that the bucket is in the loaded state.