To provide a washer having a structure that disperses and reduces a vertical compression load transmitted via a screw related to the corrugated board fixing washer so that the load may not be concentrated on the axis of the screw, and to provide a fixing member, an attachment structure and a container.

The corrugated board fixing washer 1 used for fixing a member to be fixed to a corrugated board by screwing comprises a pressing claw 4 which is formed so as to protrude by bending adjacent two corners of a rectangular flat plate to a washer bottom side, and an attachment hole 2 for allowing the penetration of the axis of the screw when the screw is seated on the center of the flat plate. The pressing claw 4 bites into the corrugated board, and disperses and reduces the vertical compression load transmitted to the corrugated board via the screw.