To compulsorily impregnate a base material with an attaching liquid while exhausting the air in the base material having impregnating ability.

An impregnating tool 33 has a liquid-storing chamber 47 surrounded by an inlet side edge 49 at the inlet side of the base material S, an outlet side edge 48 at the outlet side of the base material S and both left and right side sealing parts 43 and 44, formed so as to face to a base material space 2a formed in a supporter 2, and a liquid-feeding device 5 for quantitatively feeding the attaching liquid E to the liquid-storing chamber 47 and storing the attaching liquid E in a pressurized state, in the impregnation apparatus 31 for impregnating the base material S with the attaching liquid e while moving at least one of the base material S supported by the supporter 2 and having the impregnating ability, and the impregnating tool 33.