1. An impregnation type face mask having at least one knob portion projecting outward and being folded, said face mask comprising a reinforced cellulose nonwoven fabric as a sheet base material, said sheet base material having a basis weight of 60 g/m2 or less, an elongation percentage of 30% or less at a tensile stress of 3.9 N/5 cm when being wetted, and a relative bending resistance of 5 mN·cm or less when being wetted, said face mask being impregnated with a facial pack lotion with a viscosity of 0.5 to 10 Pa·sec in an amount of 50 wt % or more based on the weight of the sheet base material.