A panel member as a floor panel of an automobile comprising a plurality of circular or elliptical recessed parts linearly arranged, wherein: when it is assumed that a portion where three recessed parts are linearly aligned is called a recessed part group (G), there are at least a first recessed part group (G1) and a second recessed part group (G2) arranged in parallel with the first recessed part group (G1); an angle formed between a first straight line (L1) linking a center of the recessed part in the first recessed part group (G1) and a center of the recessed part in the second recessed part group (G2) located at a position closest to the recessed part in the first recessed part, and, a second straight line (L2) linking centers of the recessed parts in the first recessed part group (G1) is 80 degrees or more and 100 degrees or less; the recessed part is composed of a bottom part constituting a bottom surface of the recessed part and a side wall part erected around the bottom part; an inclination angle ξ formed between the bottom part and the side wall part is 20 degrees or more and 90 degrees or less; characterized in that when it is assumed that a diameter or an average diameter of the recessed part is d and a distance between the recessed parts adjacent to each other is s, a distance between the adjacent recessed parts in the first recessed part group (G1), a distance between the adjacent recessed parts in the second recessed part group (G2), and a distance between the recessed part in the first recessed part group (G1) and the recessed part in the second recessed part group (G2) each satisfy s ≤ 3d/10; and the recessed parts are configured such that the recessed part group (G) in which the three recessed parts are linearly aligned is arranged along a vehicle length direction of the automobile. when it is assumed that a portion where three recessed parts are linearly aligned is called a recessed part group (G), there are at least a first recessed part group (G1) and a second recessed part group (G2) arranged in parallel with the first recessed part group (G1); an angle formed between a first straight line (L1) linking a center of the recessed part in the first recessed part group (G1) and a center of the recessed part in the second recessed part group (G2) located at a position closest to the recessed part in the first recessed part, and, a second straight line (L2) linking centers of the recessed parts in the first recessed part group (G1) is 80 degrees or more and 100 degrees or less; the recessed part is composed of a bottom part constituting a bottom surface of the recessed part and a side wall part erected around the bottom part; an inclination angle ξ formed between the bottom part and the side wall part is 20 degrees or more and 90 degrees or less; characterized in that when it is assumed that a diameter or an average diameter of the recessed part is d and a distance between the recessed parts adjacent to each other is s, a distance between the adjacent recessed parts in the first recessed part group (G1), a distance between the adjacent recessed parts in the second recessed part group (G2), and a distance between the recessed part in the first recessed part group (G1) and the recessed part in the second recessed part group (G2) each satisfy s ≤ 3d/10; and the recessed parts are configured such that the recessed part group (G) in which the three recessed parts are linearly aligned is arranged along a vehicle length direction of the automobile. <EOS>