A surface-treatment agent containing at least one type of processed starch selected from a) to c) as listed below is applied to a base paper of a newspaper so that a product of a B-type viscosity of the surface-treatment agent, measured under conditions of 10% concentration at 50 C. (rotor No. 1 at 60 rpm), and an application amount of the surface-treatment agent (both sides) is within a range of 2 to 15 cpsg/m2;

    • a) Etherified starch, which is etherified by the compound defined in the general formula (1) given below:

    • wherein A represents an ethylene group or propylene group, while n represents an integer of 1 to 15,
    • b) Carboxylic acid esterified starch, which is esterified by monocarboxylic acid or dicarboxylic acid containing a linear, branched or cyclic alkyl group or alkenyl group having carbon atoms of 4 to 18, and
    • c) Aldehyde starch.
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