An ear hook member has an annular sheet shape and has, in a plan view thereof, a first direction corresponding to an up-and-down direction of the mask and a second direction orthogonal to the first direction. The ear hook member includes: a first surface material; a second surface material that is disposed on an opposite side to the first surface material; and a plurality of stretchable string materials between the first surface material and the second surface material, the plurality of stretchable string materials being spaced from each other in the first direction and respectively extending along the second direction. Each of the stretchable string materials is adhered to the first surface material and the second surface material, with the stretchable string materials being stretched.