A vehicle (10; 10A;10B) with a tail gate (40; 40A), the tail gate being supported on a vehicle body for opening and closing a rear opening in a rear part of the vehicle body, the vehicle comprising: a sub opening (50; 50A) formed in the tail gate (40; 40A); and a sub door (60; 60A; 60B) for opening and closing the sub opening (50; 50A) in a widthwise direction of the vehicle, wherein the tail gate (40; 40A) is attached to an upper part of the vehicle body in such a manner as to vertically swing on a pivot axis extending horizontally, wherein the sub opening (50; 50A) has a width in the widthwise direction of the vehicle set to be smaller than a width of the rear opening and also set to be a generally half of a width of the tail gate (40; 40A), wherein the sub opening (50; 50A) has one lateral edge in the widthwise direction of the vehicle located at one lateral end of the tail gate (50; 50A) in the widthwise direction of the vehicle, wherein the vehicle body has a driver's seat disposed therein, the driver's seat being offset toward one lateral side of the vehicle relative to a widthwise center of the vehicle body, and the one lateral edge of the sub opening (50; 50A) is located only on an opposite side of the driver's seat relative to the widthwise center of the vehicle body, characterised in that the sub door (60; 60A) is supported on the tail gate (40; 40A) so as to begin to open the sub opening (50; 50A) at the one lateral edge thereof, and the sub door (60; 60A; 60B) is attached to the tail gate (40; 40A) by hinges (80, 80) on the other lateral edge of the sub opening (50; 50A) to allow the sub door (60; 60A; 60B) to swing in the widthwise direction of the vehicle (10; 10A; 10B). a sub opening (50; 50A) formed in the tail gate (40; 40A); and a sub door (60; 60A; 60B) for opening and closing the sub opening (50; 50A) in a widthwise direction of the vehicle, wherein the tail gate (40; 40A) is attached to an upper part of the vehicle body in such a manner as to vertically swing on a pivot axis extending horizontally, wherein the sub opening (50; 50A) has a width in the widthwise direction of the vehicle set to be smaller than a width of the rear opening and also set to be a generally half of a width of the tail gate (40; 40A), wherein the sub opening (50; 50A) has one lateral edge in the widthwise direction of the vehicle located at one lateral end of the tail gate (50; 50A) in the widthwise direction of the vehicle, wherein the vehicle body has a driver's seat disposed therein, the driver's seat being offset toward one lateral side of the vehicle relative to a widthwise center of the vehicle body, and the one lateral edge of the sub opening (50; 50A) is located only on an opposite side of the driver's seat relative to the widthwise center of the vehicle body, characterised in that the sub door (60; 60A) is supported on the tail gate (40; 40A) so as to begin to open the sub opening (50; 50A) at the one lateral edge thereof, and the sub door (60; 60A; 60B) is attached to the tail gate (40; 40A) by hinges (80, 80) on the other lateral edge of the sub opening (50; 50A) to allow the sub door (60; 60A; 60B) to swing in the widthwise direction of the vehicle (10; 10A; 10B).