To provide a gas permeability measuring device capable of measuring gas permeability of a comparatively thin sheet material in the fitted state to its using state.
This device is equipped with a pair of sandwiching jigs 2 for sandwiching the sheet material 3 which is a test sample, and is equipped in the pair of sandwiching jigs 2 with a passage hole 23 for forming a gas passage L through the sheet material 3, in the sandwiching state wherein the sheet material 3 is sandwiched. The device is also equipped with a humidified gas supply device 5 for humidifying and supplying gas a into the gas passage L, and a temperature adjusting device 6 for adjusting the temperature of the humidified gas, and a differential pressure measuring part 26 is provided, capable of measuring the differential pressure generated in the gas passage across the sandwiching position of the sheet material 3.
KAWASAKI SHINICHI
SHINTAKU HIDEKI
YAMAZAKI OSAMU
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