Fuel tank

A fuel tank having a recess-shaped portion formed continuously from a tank main body and protruding inward, the fuel tank including:

• an inner pinch reducing recess portion being disposed on one side or an other side of an inner pinch generation concern region, or a plurality of inner pinch reducing recess portions being respectively disposed on one of the one side and the other side of the inner pinch generation concern region where there is a concern of an inner pinch being generated when molding between the recess-shaped portion and an upstanding wall of the tank main body or between two of the recess-shaped portions, wherein
• the inner pinch reducing recess portion is separated from the recess-shaped portion,
• the tank main body is a rectangular cube and includes:
• an upper wall that is flat and extends in a first direction and a second direction;
• a lower wall that is flat, the lower wall is spaced away from and parallel to the flat upper wall;
• and
• a plurality of sidewalls that are flat, each of the sidewalls is connected to and extends from each of the upper wall and the lower wall,
• the inner pinch generation concern region is a predetermined area of at least one of the upper wall and the lower wall, the inner pinch generation concern region has a predetermined alignment with the recess-shaped portion in the first direction and the second direction,
• the inner pinch reducing recess portion extends along at least one of the upper wall and the lower wall and overlaps at least a portion of the inner pinch generation concern region,
• the recess-shaped portion protrudes toward the upper wall or the lower wall in a depth direction that is orthogonal to the first direction and the second direction, the recess-shaped portion protrudes in the depth direction to a first depth, and
• the inner pinch reducing portion protrudes toward the upper wall or the lower wall in the depth direction to a second depth that is less than the first depth.