A working vehicle includes a vehicle frame having a front section and a bonnet arranged on the front section. A first engagement mechanism for the bonnet is provided at a front section of the vehicle frame and a second engagement mechanism is provided at a front lower end section of the bonnet. A front face of the vehicle frame includes a cutout section and a cover doubling as a seal member for the bonnet is provided at the cutout section. When the first and second engagement mechanisms are engaged, the first and second engagement mechanisms are positioned on one side of the cutout section and a portion of the cover that covers the cutout section is positioned on an opposite side of the cutout section. The construction can provide the bonnet with high assembly accuracy.