A wheel loader comprising: a body frame; a bucket; a boom that connects the bucket and the body frame; and a bell crank, the bucket comprising: a linear lower front edge; a first straight portion horizontally extending from the lower front edge toward an innermost of the bucket; characterised by an inclined portion continuous with a rear edge of the first straight portion, the inclined portion further extending toward the innermost of the bucket while being inclined upward; a curve continuous with a rear edge of the inclined portion at a lower edge of the curve, the curve having a predetermined bucket radius; a second straight portion continuous with an upper edge of the curve, the second straight portion being inclined upward toward an opening of the bucket; a third straight portion bent at a bent portion toward the opening relative to a front edge of the second straight portion, the third straight portion further extending toward the opening; and a stop provided to a back surface of the second straight portion, wherein the stop is positioned opposite to the boom and is configured to be brought into contact with the boom, when the wheel loader is in a travelling position, wherein the second straight portion is positioned opposite to the boom so that a distance between the bucket and the boom is minimized at the majority of the second straight portion including the bent portion, when the wheel loader is in the travelling position, and wherein the bucket is tilted at a maximum with the opening facing upward and a front edge of each of side plates of the bucket is substantially leveled, when the wheel loader is in the travelling position. a body frame; a bucket; a boom that connects the bucket and the body frame; and a bell crank, the bucket comprising: a linear lower front edge; a first straight portion horizontally extending from the lower front edge toward an innermost of the bucket; characterised by an inclined portion continuous with a rear edge of the first straight portion, the inclined portion further extending toward the innermost of the bucket while being inclined upward; a curve continuous with a rear edge of the inclined portion at a lower edge of the curve, the curve having a predetermined bucket radius; a second straight portion continuous with an upper edge of the curve, the second straight portion being inclined upward toward an opening of the bucket; a third straight portion bent at a bent portion toward the opening relative to a front edge of the second straight portion, the third straight portion further extending toward the opening; and a stop provided to a back surface of the second straight portion, a linear lower front edge; a first straight portion horizontally extending from the lower front edge toward an innermost of the bucket; characterised by an inclined portion continuous with a rear edge of the first straight portion, the inclined portion further extending toward the innermost of the bucket while being inclined upward; a curve continuous with a rear edge of the inclined portion at a lower edge of the curve, the curve having a predetermined bucket radius; a second straight portion continuous with an upper edge of the curve, the second straight portion being inclined upward toward an opening of the bucket; a third straight portion bent at a bent portion toward the opening relative to a front edge of the second straight portion, the third straight portion further extending toward the opening; and a stop provided to a back surface of the second straight portion, wherein the stop is positioned opposite to the boom and is configured to be brought into contact with the boom, when the wheel loader is in a travelling position, wherein the second straight portion is positioned opposite to the boom so that a distance between the bucket and the boom is minimized at the majority of the second straight portion including the bent portion, when the wheel loader is in the travelling position, and wherein the bucket is tilted at a maximum with the opening facing upward and a front edge of each of side plates of the bucket is substantially leveled, when the wheel loader is in the travelling position.