A work vehicle, comprising: - an exhaust pipe configured to send out exhaust gas of an engine of the work vehicle, - an intermediate cylinder is fitted around the exhaust pipe and fixed to a discharge-side end portion of the exhaust pipe with use of a plurality of bolts , and - an exhaust gas diffusing device (A) configured to receive outside air and mix the outside air with the exhaust gas, the exhaust gas diffusing device (A) including: - an outside air mixing cylinder having an inner diameter (D2) larger than the outer diameter (D1) of the discharge-side end portion of the exhaust pipe , positioned to receive the exhaust gas from the exhaust pipe , and configured to receive outside air and - at least one air director supported by the intermediate cylinder and disposed only in the exhaust pipe at the discharge-side end portion of the exhaust pipe to promote the mixing of the exhaust gas with the outside air, wherein the at least one air director does not coincide with the outside air mixing cylinder as viewed in a direction orthogonal to the direction in which the exhaust gas flows. - an exhaust pipe configured to send out exhaust gas of an engine of the work vehicle, - an intermediate cylinder is fitted around the exhaust pipe and fixed to a discharge-side end portion of the exhaust pipe with use of a plurality of bolts , and - an exhaust gas diffusing device (A) configured to receive outside air and mix the outside air with the exhaust gas, the exhaust gas diffusing device (A) including: - an outside air mixing cylinder having an inner diameter (D2) larger than the outer diameter (D1) of the discharge-side end portion of the exhaust pipe , positioned to receive the exhaust gas from the exhaust pipe , and configured to receive outside air and - at least one air director supported by the intermediate cylinder and disposed only in the exhaust pipe at the discharge-side end portion of the exhaust pipe to promote the mixing of the exhaust gas with the outside air, wherein the at least one air director does not coincide with the outside air mixing cylinder as viewed in a direction orthogonal to the direction in which the exhaust gas flows. the exhaust gas diffusing device (A) including: - an outside air mixing cylinder having an inner diameter (D2) larger than the outer diameter (D1) of the discharge-side end portion of the exhaust pipe , positioned to receive the exhaust gas from the exhaust pipe , and configured to receive outside air and - at least one air director supported by the intermediate cylinder and disposed only in the exhaust pipe at the discharge-side end portion of the exhaust pipe to promote the mixing of the exhaust gas with the outside air, - an outside air mixing cylinder having an inner diameter (D2) larger than the outer diameter (D1) of the discharge-side end portion of the exhaust pipe , positioned to receive the exhaust gas from the exhaust pipe , and configured to receive outside air and - at least one air director supported by the intermediate cylinder and disposed only in the exhaust pipe at the discharge-side end portion of the exhaust pipe to promote the mixing of the exhaust gas with the outside air, wherein the at least one air director does not coincide with the outside air mixing cylinder as viewed in a direction orthogonal to the direction in which the exhaust gas flows. <EOS>