A working vehicle comprising: a travel machine body which mounts an engine thereon; right and left front wheels which are provided in a lower side of a front portion of the travel machine body; a track frame which is provided in a lower side of a rear portion of the travel machine body; right and left travel crawlers which are installed to the track frame; a rear axle which transmits a rotating force to the travel crawler; and an oscillation supporting point shaft (27, 28, 30, 31) which supports the track frame to the travel machine body so as to freely oscillate, wherein the rear axle and the oscillation supporting point shaft (27, 28, 30, 31) are provided so as to be spaced, the oscillation supporting point shaft (27, 28, 30, 31) is arranged just below an axle case to which the rear axle is pivoted, and the track frame is connected to the axle case via a link member (19, 20) which is provided in the oscillation supporting point shaft (27, 28, 30, 31), wherein the oscillation supporting point shaft (27, 28, 30, 31) is formed by front and rear upper end pivot shafts (27, 28) and front and rear lower end pivot shafts (30, 31), wherein the front and rear upper end pivot shafts (27, 28) are provided in the axle case, wherein the front and rear lower pivot shafts (30, 31) are provided in the track frame, upper and lower end portions of the front and rear link members (19, 20) are connected to the pivot shafts (27, 28, 30, 31), wherein the front and rear link members (19, 20) are arranged so as to be tapered in a side elevational view of the machine body, and wherein a distance in the lower end side of the front and rear link members (19, 20) is larger than a distance in the upper end side of the front and rear link members (19, 20). a travel machine body which mounts an engine thereon; right and left front wheels which are provided in a lower side of a front portion of the travel machine body; a track frame which is provided in a lower side of a rear portion of the travel machine body; right and left travel crawlers which are installed to the track frame; a rear axle which transmits a rotating force to the travel crawler; and an oscillation supporting point shaft (27, 28, 30, 31) which supports the track frame to the travel machine body so as to freely oscillate, wherein the rear axle and the oscillation supporting point shaft (27, 28, 30, 31) are provided so as to be spaced, the oscillation supporting point shaft (27, 28, 30, 31) is arranged just below an axle case to which the rear axle is pivoted, and the track frame is connected to the axle case via a link member (19, 20) which is provided in the oscillation supporting point shaft (27, 28, 30, 31), wherein the oscillation supporting point shaft (27, 28, 30, 31) is formed by front and rear upper end pivot shafts (27, 28) and front and rear lower end pivot shafts (30, 31), wherein the front and rear upper end pivot shafts (27, 28) are provided in the axle case, wherein the front and rear lower pivot shafts (30, 31) are provided in the track frame, upper and lower end portions of the front and rear link members (19, 20) are connected to the pivot shafts (27, 28, 30, 31), wherein the front and rear link members (19, 20) are arranged so as to be tapered in a side elevational view of the machine body, and wherein a distance in the lower end side of the front and rear link members (19, 20) is larger than a distance in the upper end side of the front and rear link members (19, 20).