A battery pack cover in a form of a square tray to cover an upper portion of a battery pack, the battery pack cover comprising: a plate-shaped upper surface portion having irregularities, the irregularities being either recesses or protrusions on one or both sides of the upper surface portion; and a side portion bent and extended from the upper surface portion, forming a plane perpendicular to the upper surface portion, and covering an upper side surface of the battery pack, wherein the irregularities formed on the upper surface portion include an area in which a center line is a straight line, satisfy following conditions 1 to 3: [Condition 1] in an area where the center line is a straight line, one end of the center line faces one of four sides of the upper surface portion, and an opposite end of the center line faces another side so that an extension of the centerline does not intersect a corner of the upper surface portion; [Condition 2] the center line of each of two irregularities is a straight line and are connected, and the connected center lines face two opposite sides of the upper surface portion; and [Condition 3] ends of a centerline of an irregularity face two adjacent sides among four sides of the upper surface portion, wherein each of the irregularities formed on the upper surface portion has a bead-shaped recessed shape, and wherein the irregularities are formed on an upper surface of the plate-shaped upper surface portion, wherein the irregularities formed on the upper surface portion comprise: a first shape having a closed figure shape, wherein the first shape forms a polygonal structure with four or more sides when connecting the center lines of the irregularities; and a second shape with an open figure shape, wherein the second shape forms a polygonal structure with one side open. a plate-shaped upper surface portion having irregularities, the irregularities being either recesses or protrusions on one or both sides of the upper surface portion; and a side portion bent and extended from the upper surface portion, forming a plane perpendicular to the upper surface portion, and covering an upper side surface of the battery pack, wherein the irregularities formed on the upper surface portion include an area in which a center line is a straight line, satisfy following conditions 1 to 3: [Condition 1] in an area where the center line is a straight line, one end of the center line faces one of four sides of the upper surface portion, and an opposite end of the center line faces another side so that an extension of the centerline does not intersect a corner of the upper surface portion; [Condition 2] the center line of each of two irregularities is a straight line and are connected, and the connected center lines face two opposite sides of the upper surface portion; and [Condition 3] ends of a centerline of an irregularity face two adjacent sides among four sides of the upper surface portion, wherein each of the irregularities formed on the upper surface portion has a bead-shaped recessed shape, and wherein the irregularities are formed on an upper surface of the plate-shaped upper surface portion, wherein the irregularities formed on the upper surface portion comprise: a first shape having a closed figure shape, wherein the first shape forms a polygonal structure with four or more sides when connecting the center lines of the irregularities; and a second shape with an open figure shape, wherein the second shape forms a polygonal structure with one side open. [Condition 1] in an area where the center line is a straight line, one end of the center line faces one of four sides of the upper surface portion, and an opposite end of the center line faces another side so that an extension of the centerline does not intersect a corner of the upper surface portion; [Condition 2] the center line of each of two irregularities is a straight line and are connected, and the connected center lines face two opposite sides of the upper surface portion; and [Condition 3] ends of a centerline of an irregularity face two adjacent sides among four sides of the upper surface portion, wherein each of the irregularities formed on the upper surface portion has a bead-shaped recessed shape, and wherein the irregularities are formed on an upper surface of the plate-shaped upper surface portion, wherein the irregularities formed on the upper surface portion comprise: a first shape having a closed figure shape, wherein the first shape forms a polygonal structure with four or more sides when connecting the center lines of the irregularities; and a second shape with an open figure shape, wherein the second shape forms a polygonal structure with one side open. ends of a centerline of an irregularity face two adjacent sides among four sides of the upper surface portion, wherein each of the irregularities formed on the upper surface portion has a bead-shaped recessed shape, and wherein the irregularities are formed on an upper surface of the plate-shaped upper surface portion, wherein the irregularities formed on the upper surface portion comprise: a first shape having a closed figure shape, wherein the first shape forms a polygonal structure with four or more sides when connecting the center lines of the irregularities; and a second shape with an open figure shape, wherein the second shape forms a polygonal structure with one side open. a first shape having a closed figure shape, wherein the first shape forms a polygonal structure with four or more sides when connecting the center lines of the irregularities; and a second shape with an open figure shape, wherein the second shape forms a polygonal structure with one side open.