Acidic gas separation membrane sheet and manufacturing method therefor

An acidic gas separation membrane sheet that causes an acidic gas to selectively permeate therethrough, comprising:

• a first porous layer, a hydrophilic resin composition layer, and a second porous layer in this order,
• wherein:
• a second peel strength between the second porous layer and the hydrophilic resin composition layer is less than a first peel strength between the first porous layer and the hydrophilic resin composition layer,
• an average value of the second peel strength is within a range of greater than or equal to 98 N/m and less than or equal to 500 N/m,
• the average value of the second peel strength is a value obtained by leaving a 25 mm×100 mm sample that has been cut out of the acidic gas separation membrane sheet in an environment of a temperature of 25° C. and a humidity of 50% RH for at least 2 hours, attaching the sample to a peel tester, and averaging values of peel strength for 5 seconds to 15 seconds after the start of the measurement for time-lapse data of the peel strength measured under the condition of a peel angle of 180 degrees and a peel speed of 300 mm/min, and
• wherein a ratio of a standard deviation of the second peel strength to the average value of the second peel strength (standard deviation/average value) is less than 0.5, and the ratio of a standard deviation of the second peel strength to the average value of the second peel strength is obtained at the same condition for obtaining the average value of the second peel strength.