To surely notify information regarding the pressure of an inspiring gas in a pressure vessel 6 to a wearer 2, and increase safety.

The pressure of the inspiring gas of the pressure vessel 6 is detected by a pressure sensor 32. In this case, the pressure vessel 6 is provided on an inspiring gas feeding device 3 which is fitted on a human body 2. Then, from a light emitting element 36 in a housing 25 for signal transmission, which is provided at the location on the breast of the human body, information regarding the pressure is transmitted together with an address. The inspiring gas from the inspiring tube 10 of the inspiring gas feeding device 3 is introduced to a mask body 5. On the side section of the mask body 5, a housing 47 for signal receiving is provided. The light signal from the light emitting element 36 is received by a light receiving element 66, and the flickering cycle and the light emitting color of a light emitting element 59 for display are changed through an arm 48. The light emitting element 59 for display exists in a visual field 58 of the mask body 5 of the wearer. Therefore, there is no fear that the wearer 2 overlooks the content of the display, and the respirator is safe.