To provide an etched metal thin sheet for a shadow mask, which is finished to a shadow mask by breaking a half-etching wire by plucking, and removing a margin part, capable of preventing flaw even if the corner part of the margin part or the corner part in the skirt part comes into contact with an image part or rubs the part in plucking the margin part.

The corner parts in the vicinity of four corners of the skirt part 43 are rounded corner parts 51, and the corner part in the margin part corresponding to the vicinity of four corners of the skirt part is a rounded corner part 61.