This working vehicle is equipped with: an engine; a variable-capacity fan pump and a first variable-capacity traveling pump which are driven by the engine; a first variable-capacity traveling motor which is rotated by the hydraulic force of the first variable-capacity traveling pump; a traveling device which is driven by the first variable-capacity traveling motor; a fan motor which is rotated by the hydraulic force of the variable-capacity fan pump; a fan which is driven by the fan motor; an overrun state detection part for detecting an overrun state of the traveling device; and a control unit. When the value detected by the overrun state detection part has become equal to or greater than a first threshold value, the control unit increases the rotation speed of the fan so as to reach a first fan rotation speed. When the detected value has become equal to or greater than a second threshold value which is greater than the first threshold value, the control unit controls the rotation speed of the fan so as to reach a second fan rotation speed which is faster than the first fan rotation speed.