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, there are at least a first recessed part group and a second recessed part group arranged in parallel with the first recessed part group; an angle formed between a first straight line linking a center of the recessed part in the first recessed part group and a center of the recessed part in the second recessed part group located at a position closest to the recessed part in the first recessed part, and, a second straight line linking centers of the recessed parts in the first recessed part group 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, a distance between the adjacent recessed parts in the second recessed part group, and a distance between the recessed part in the first recessed part group and the recessed part in the second recessed part group each satisfy s ≤ 3d/10; and the recessed parts are configured such that the recessed part group 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, there are at least a first recessed part group and a second recessed part group arranged in parallel with the first recessed part group; an angle formed between a first straight line linking a center of the recessed part in the first recessed part group and a center of the recessed part in the second recessed part group located at a position closest to the recessed part in the first recessed part, and, a second straight line linking centers of the recessed parts in the first recessed part group 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, a distance between the adjacent recessed parts in the second recessed part group, and a distance between the recessed part in the first recessed part group and the recessed part in the second recessed part group each satisfy s ≤ 3d/10; and the recessed parts are configured such that the recessed part group in which the three recessed parts are linearly aligned is arranged along a vehicle length direction of the automobile.