To provide a more excellent
humidity measuring device.SOLUTION: A
humidity measuring device includes: a temperature and
humidity measuring portion 26 including a thermosensor measuring temperature and a
moisture sensitive element measuring humidity; a housing 102 including a housing portion 112 housing the temperature and humidity measuring portion; a display portion 14 including an indicator and fixed to the housing; and joint
piping 122 connected to the middle of a
pipe in which gas flows and enabling the gas to flow between pipes. The joint
piping includes an orifice 130, a filter 128 is attached to the joint
piping, and the housing 102 includes first piping 118 and second piping 120 connecting the joint piping and the housing portion and enabling the gas to flow between the joint piping and the housing portion.SELECTED DRAWING: Figure 22