To provide a nonwoven fabric for a mask that has not only an excellent filter performance but also an excellent fitting property to skin and further has a good skin touch feeling, and to provide a mask including the nonwoven fabric for a mask.

There are provided a nonwoven fabric for a mask and a mask having a basis weight of 10 to 40 g/m², a gas permeability of 30 to 100 cc/cm²/sec and a bending resistance of 5.0 cm or less by using an ultrafine polyester fiber A that includes polyester and has a single fiber diameter (D) of 500 to 1000nm, and the ratio (L/D) of a fiber length (L) nm to the single fiber diameter (D) nm falls in the range of 600 to 3000.