Problem to be solved: to provide a light weight and low cost mounting device for low oxygen training with simple structure capable of performing low oxygen training.The mounting device comprises a mounting body and an ear string.The body of the mounting device formed of a cloth like member capable of being flowable and molded into the shape of the three-dimensional type mask is constituted by a three-dimensional portion 10 formed in a shape covering the lower side and the mouth of the nose of the user, and a face contact portion 20 closely connected to the user's face.The ear strap string 30 is stretchable and disposed on the right and left sides of the mounting body.On the rear surface side of the stereoscopic portion 10, a peripheral portion of the filter holding member 12 capable of flowing air is fixed to the three-dimensional portion 10 so as to be in close contact with the rear surface of the three-dimensional portion 10.An oxygen amount adjusting filter 11 for controlling the flow rate of passing air is disposed between the solid portion 10 and the filter holding member 12.Diagram
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