To obtain an embossed thin plate material in which its rigidity is increased by attaching recesses and projections to at least part of a metal thin plate and which is of high rigidity as a whole with a different flexural rigidity depending on a direction (with a high rigidity in a specific direction and a comparatively low rigidity in another direction).

The embossed thin plate material is characterized in that: with a neutral plate surface prior to applying recesses and projections as a reference, a projection row part in which a plurality of projections projecting at intervals on one side of the front and back surfaces of the neutral plate surface are arranged in rows and a recess row part in which a plurality of recesses projecting at intervals on the other side of the front and back surfaces thereof are arranged are arranged alternately; and the projection part of the projection row part and the recess part of the recess row part are arranged in a positional relationship in which both parts are not located on one straight line when viewed from a direction perpendicular to the projection row part and the recess row part in the neutral plate surface plane.