A flush toilet for discharging waste using flush water supplied from a flush water source, the flush toilet comprising: a bowl portion including a bottom, a bowl-shaped waste receiving surface, a rim portion formed on the top edge portion of the bowl portion so that an inner circumferential surface of the rim portion rises essentially vertically, and a shelf portion formed between the rim portion and the waste receiving surface, the inner circumferential surface of the rim portion having a rim spouting port; a water discharge path for discharging the waste, the path including an inlet which is connected at the bottom of the bowl portion; a rim water conduit formed by the interior of the rim portion and extending to the rim spouting port for supplying the flush water to the rim spouting port, wherein the rim spouting port spouts the flush water out of the rim water conduit onto the shelf portion of the bowl portion to form a swirl flow along a vertical surface of the rim portion, characterized in that: the rim spouting port is formed in the front region of the bowl portion in the vicinity of a front end portion of the rim portion of the bowl portion, and a part of the inner circumferential surface in the front region (Fl) of the rim portion is formed into an overhang shape in the vicinity of the front end portion of the rim portion by the vertical surface and a horizontal surface extending inward from the vertical surface to form an overhanging part which is formed to be left-right symmetrical with respect to a center line (Al) which equally divides the bowl portion in a left-right direction, of the rim portion of the bowl portion so as to cover the rim spouting port in order to form the overhang shape; and a forward protruding concave space is formed on the shelf portion in the vicinity of the front end portion of the rim portion by the vertical surface and horizontal surface, and within this concave space the rim spouting port and the vertical surface of the rim portion are continuous so as to be flush, wherein the rim spouting port is formed on the top end side of the rim portion at a predetermined distance (h) above the shelf portion. a bowl portion including a bottom, a bowl-shaped waste receiving surface, a rim portion formed on the top edge portion of the bowl portion so that an inner circumferential surface of the rim portion rises essentially vertically, and a shelf portion formed between the rim portion and the waste receiving surface, the inner circumferential surface of the rim portion having a rim spouting port; a water discharge path for discharging the waste, the path including an inlet which is connected at the bottom of the bowl portion; a rim water conduit formed by the interior of the rim portion and extending to the rim spouting port for supplying the flush water to the rim spouting port, wherein the rim spouting port spouts the flush water out of the rim water conduit onto the shelf portion of the bowl portion to form a swirl flow along a vertical surface of the rim portion, characterized in that: the rim spouting port is formed in the front region of the bowl portion in the vicinity of a front end portion of the rim portion of the bowl portion, and a part of the inner circumferential surface in the front region (Fl) of the rim portion is formed into an overhang shape in the vicinity of the front end portion of the rim portion by the vertical surface and a horizontal surface extending inward from the vertical surface to form an overhanging part which is formed to be left-right symmetrical with respect to a center line (Al) which equally divides the bowl portion in a left-right direction, of the rim portion of the bowl portion so as to cover the rim spouting port in order to form the overhang shape; and a forward protruding concave space is formed on the shelf portion in the vicinity of the front end portion of the rim portion by the vertical surface and horizontal surface, and within this concave space the rim spouting port and the vertical surface of the rim portion are continuous so as to be flush, wherein the rim spouting port is formed on the top end side of the rim portion at a predetermined distance (h) above the shelf portion. the rim spouting port is formed in the front region of the bowl portion in the vicinity of a front end portion of the rim portion of the bowl portion, and a part of the inner circumferential surface in the front region (Fl) of the rim portion is formed into an overhang shape in the vicinity of the front end portion of the rim portion by the vertical surface and a horizontal surface extending inward from the vertical surface to form an overhanging part which is formed to be left-right symmetrical with respect to a center line (Al) which equally divides the bowl portion in a left-right direction, of the rim portion of the bowl portion so as to cover the rim spouting port in order to form the overhang shape; and a forward protruding concave space is formed on the shelf portion in the vicinity of the front end portion of the rim portion by the vertical surface and horizontal surface, and within this concave space the rim spouting port and the vertical surface of the rim portion are continuous so as to be flush, wherein the rim spouting port is formed on the top end side of the rim portion at a predetermined distance (h) above the shelf portion.