Work mask wearing device and helmet using same

Provided is a work mask wearing device in which the necessity for fine adjustment of the angle of the mounting of the mask on a helmet can be eliminated, even if there is a large difference among the positions of the lips of on the faces of workers. The helmet (A1) comprises work mask wearing devices (100) attached to the right and left ear portions of the edge part (a1) of the helmet (A1), respectively, and a work mask connected to each of the work mask wearing devices (100). The work mask wearing device (100) comprises a first plate (10) with a holding part (12) at one end and a second plate (20) foldably connected to the other end of the first plate. The second plate (20) is provided with a fixed plate part (211) and a movable plate part (212), and the movable plate part (212) is rotatable not only in a opened state, but also in a closed state with respect to the first plate (10).