A working vehicle comprising: a first traveling shaft to be rotated by power of a prime mover; a second traveling shaft to be rotated by the power of the prime mover and to transmit the power to a wheel (7F, 7R); a first hydraulic clutch (5f1) connected to the first traveling shaft; a second hydraulic clutch (5f2) connected to the first traveling shaft separately from the first hydraulic clutch (5f1); a first gear mechanism to transmit, to the second traveling shaft, power from the first hydraulic clutch (5f1) when the first hydraulic clutch (5f1) is engaged and not to transmit, to the second traveling shaft, power from the first hydraulic clutch (5f1) when the first hydraulic clutch (5f1) is disengaged; a second gear mechanism to transmit, to the second traveling shaft, power from the second hydraulic clutch (5f2) when the second hydraulic clutch (5f2) is engaged and not to transmit, to the second traveling shaft, power from the second hydraulic clutch (5f2) when the second hydraulic clutch (5f2) is disengaged; a first hydraulic control valve having a first aperture to be changed in accordance with a first control signal, the first hydraulic control valve being configured to supply operation fluid to the first hydraulic clutch (5f1) and drain the operation fluid from the first hydraulic clutch (5f1); a second hydraulic control valve having a second aperture to be changed in accordance with a second control signal, the second hydraulic control valve being configured to supply operation fluid to the second hydraulic clutch (5f2) and drain the operation fluid from the second hydraulic clutch (5f2); and characterized by a controller device to gradually reduce an ON-time of a first square wave of the first control signal, which magnetizes a first solenoid of the first hydraulic control valve during each one of a plurality of periods within a predetermined time when the first hydraulic clutch (5f1) is switched from being engaged to being disengaged, or to gradually reduce an ON-time of a second square wave of the second control signal, which magnetizes a second solenoid of the second hydraulic control valve, during each one of the plurality of periods within the predetermined time when the second hydraulic clutch (5f2) is switched from being engaged to being disengaged. a first traveling shaft to be rotated by power of a prime mover; a second traveling shaft to be rotated by the power of the prime mover and to transmit the power to a wheel (7F, 7R); a first hydraulic clutch (5f1) connected to the first traveling shaft; a second hydraulic clutch (5f2) connected to the first traveling shaft separately from the first hydraulic clutch (5f1); a first gear mechanism to transmit, to the second traveling shaft, power from the first hydraulic clutch (5f1) when the first hydraulic clutch (5f1) is engaged and not to transmit, to the second traveling shaft, power from the first hydraulic clutch (5f1) when the first hydraulic clutch (5f1) is disengaged; a second gear mechanism to transmit, to the second traveling shaft, power from the second hydraulic clutch (5f2) when the second hydraulic clutch (5f2) is engaged and not to transmit, to the second traveling shaft, power from the second hydraulic clutch (5f2) when the second hydraulic clutch (5f2) is disengaged; a first hydraulic control valve having a first aperture to be changed in accordance with a first control signal, the first hydraulic control valve being configured to supply operation fluid to the first hydraulic clutch (5f1) and drain the operation fluid from the first hydraulic clutch (5f1); a second hydraulic control valve having a second aperture to be changed in accordance with a second control signal, the second hydraulic control valve being configured to supply operation fluid to the second hydraulic clutch (5f2) and drain the operation fluid from the second hydraulic clutch (5f2); and characterized by a controller device to gradually reduce an ON-time of a first square wave of the first control signal, which magnetizes a first solenoid of the first hydraulic control valve during each one of a plurality of periods within a predetermined time when the first hydraulic clutch (5f1) is switched from being engaged to being disengaged, or to gradually reduce an ON-time of a second square wave of the second control signal, which magnetizes a second solenoid of the second hydraulic control valve, during each one of the plurality of periods within the predetermined time when the second hydraulic clutch (5f2) is switched from being engaged to being disengaged.