The present invention provides a container seal having excellent thermal resistance, opening ability, and sealing ability. The container seal includes a top layer having an opening tab and a bottom layer thermally bondable to aluminum foil and a container. The top layer includes: first and second partial opening tabs (102a, 502a); first and second opening guide-separating bands (108, 508) connected to the first and second partial opening tabs and formed so as to extend along the inner edge of the container entrance so that the top layer and the bottom layer can be open along the inner edge of the container entrance when the first and second opening tabs are pulled; and a ring-shaped thermal bonding layer spaced from the first and second opening guide-separating bands by the first and second separating lines and being in contact with a lip of the container outside the first and second opening guide-separating bands.In other embodiments the seal includes one partial opening tab.