The present invention provides plain printing paper comprising a paper substrate containing, as main components, cellulose pulp and calcium carbonate as a filler, and an optional cationic resin and a multivalent cation salt attached onto the paper substrate, wherein the total amount of the cationic resin and the multivalent cation salt attached on both surfaces of the paper substrate is 1.0 g/m2 to 5.0 g/m2, both inclusive, and the mass ratio of the cationic resin to the multivalent cation salt is 0:100 to 90:10, both inclusive.