PROBLEM TO BE SOLVED: To provide an air-permeable adsorption sheet having high air permeability and excellent flexibility.SOLUTION: An adsorption sheet has an adsorption material of 55-95 pts.wt., and polytetrafluoroethylene of 5-45 pts.wt. (where, the total amount of the adsorption material and polytetrafluoroethylene is 100 pts.wt.), the adsorption sheet having 0.30 g/cmor less of bulk density.