MASK AUXILIARY DEVICE

PROBLEM TO BE SOLVED: To provide an auxiliary device for masks for restoring a mask original function by eliminating clearances between mask lateral sides and a face when wearing a commercially available mask and preventing intrusion of viruses, pollens, and other fine particles in the air.SOLUTION: A triangular auxiliary device 10 for masks includes: a clearance blocking surface 2 comprising a material preventing intrusion of viruses, pollens, and other fine particles; and a first overlap width part 5 and a second overlap width part 6 provided at parts of a side of the clearance blocking surface 2 and having adhesion property to be stuck to a mask body inside lateral side. The mask auxiliary devices 10 are stuck to the mask body inside lateral sides respectively so as to make a mask body 1 a three-dimensional structure.