Mask

The present invention provides a mask which uses a stretchable sheet-like member as a material for ear-hooks, can improve the ease of wearing and the stability of wearing, and can prevent the wearer from feeling painful in the ears due to the ear-hooks. A mask (1) is provided with a mask body part (2) and a pair of ear-hook parts (3) joined to both lateral end parts of the mask body part. The ear-hook portion is formed of an elastic sheet. The ear-hook portion includes: an upper extending portion (11) extending from a lateral end portion of an upper end portion in the vertical direction of the mask body portion; and a lower extending portion (12) extending from a lateral end portion of a lower end portion of the mask body portion in the vertical direction. The expansion and contraction direction of at least one of the upper protruding portion and the lower protruding portion is a first direction (G1). The first direction is a direction inclined by a predetermined inclination angle ([gamma] 1) to the upper sid