To provide a method for attaching sucker, which is capable to attach the sucker to the sucked surface for a long time and to remove easily the sucker from the sucked surface when the sucker becomes unnecessary. The invention comprises applying a non-adhesive moisture curable resin composition to a suction surface of the sucker, the non-adhesive moisture curable resin composition comprising 100 parts by weight of a polymer (I) having a hydrolyzable silicon group of less than 50% of total molecular terminal group, and 5 to 200 parts by weight of a polymer(II) having a hydrolyzable silicon group of 50% or more of total molecular terminal group, and attaching the sucker by pressing the suction surface against a sucked surface.