Abstract: A mask is formed of an upper part, a lower part opposing the upper part and having a form generally similar to that of the upper part, and a connection part for connecting a lower edge of the upper part and an upper edge of the lower part. The left edges of the upper and lower parts are joined, and the right edges of the upper and lower parts are joined, while the upper edge of the upper part and the lower edge of the lower part are not joined. The connection part has a folding portion located between the upper part and the lower part, and is bent relative to the lower edge of the upper part and the upper edge of the lower part, so that the connection part does not protrude outwardly over the lower edge of the upper part and the upper edge of the lower part. Breathing can be made easily in the mask.

Abstract: A mask for preventing passage of a liquid type foreign material of the invention is formed of a liquid absorbing layer for absorbing the liquid type foreign material applied thereto, and a liquid transmission prevention layer disposed on the liquid absorbing layer at a downstream side of air flowing through the mask. The liquid transmission prevention layer prevents the liquid type foreign material, such as humor, absorbed by the liquid absorbing layer from contacting a wearer.

Abstract: A mask is formed of a rectangular mask main body made of a ventilating material and a longitudinal elastic member stored in and attached to the mask main body. The mask main body is formed of a rectangular rear side member facing at least a nose and a mouth of a wearer, and a rectangular front side member disposed over the rear side member. The mask main body has folded portions folded in a direction parallel to long sides of the mask main body. End portions of the folded portions are located on short sides and bound thereat. The longitudinal elastic member extends along the long sides of the mask main body and has end portions arranged not to contact the short sides of the mask main body. Since the end portions of the elastic member do not contact the user in use, the mask can be worn comfortably.

Abstract: The present invention is to provide a mask capable of improving the stiffness. The mask includes a rectangular mask main body of a ventilating material, such as paper, fabric, and non-woven fabric, having folded portions folded in the direction parallel to the longer sides of the mask main body, with the both end portions of the folded portions on the shorter sides of the mask main body being bound by welding, adhering or stitching, wherein a longitudinal elastic member is provided along the longitudinal direction parallel to the longer sides of the mask main body, with the both end portions of the longitudinal elastic member being arranged on the shorter sides of the mask main body and integrated with the shorter ends of the mask main body by welding, adhering, or stitching.