A working vehicle in which a work equipment is provided, and a power of an engine is transmitted to a tire as a driving force via a driving force transmission path, the working vehicle comprising: driving force variation means for freely varying the driving force transmitted to the tire, the driving force variation means being provided in the driving force transmission path; a torque converter having an input shaft connected to an output shaft of the driving force variation means and an output shaft, the torque converter being provided in the driving force transmission path; tire slip detection means for detecting an occurrence of a tire slip; driving force measurement means for measuring the driving force based on at least a speed ratio (e) obtained from a rotational speed (Ntin) of the input shaft of the torque converter and a rotational speed (Ntout) of the output shaft of the torque converter according to the equation e=Ntout/Ntin; and first tire slip prevention control means for controlling the driving force variation means, wherein when the tire slip detection means detects the tire slip, the driving force measurement means measures the driving force at the time of the detection of the tire slip, after the tire slip is detected, the driving force is reduced to a driving force which is lower than the detected driving force at the time of the detection of the tire slip to suppress the tire slip, after the tire slip is suppressed, the driving force is restored to a driving force which is within a certain range that is smaller than the detected driving force at the time of the detection of the tire slip, the driving force variation means is a modulation clutch that can freely vary a degree of engagement of an input side and an output side, and the tire slip prevention control means controls the degree of engagement of the modulation clutch such that the driving force becomes smaller than the driving force at the time of the detection of the tire slip. driving force variation means for freely varying the driving force transmitted to the tire, the driving force variation means being provided in the driving force transmission path; a torque converter having an input shaft connected to an output shaft of the driving force variation means and an output shaft, the torque converter being provided in the driving force transmission path; tire slip detection means for detecting an occurrence of a tire slip; driving force measurement means for measuring the driving force based on at least a speed ratio (e) obtained from a rotational speed (Ntin) of the input shaft of the torque converter and a rotational speed (Ntout) of the output shaft of the torque converter according to the equation e=Ntout/Ntin; and first tire slip prevention control means for controlling the driving force variation means, wherein when the tire slip detection means detects the tire slip, the driving force measurement means measures the driving force at the time of the detection of the tire slip, after the tire slip is detected, the driving force is reduced to a driving force which is lower than the detected driving force at the time of the detection of the tire slip to suppress the tire slip, after the tire slip is suppressed, the driving force is restored to a driving force which is within a certain range that is smaller than the detected driving force at the time of the detection of the tire slip, the driving force variation means is a modulation clutch that can freely vary a degree of engagement of an input side and an output side, and the tire slip prevention control means controls the degree of engagement of the modulation clutch such that the driving force becomes smaller than the driving force at the time of the detection of the tire slip.