To provide base paper for a paper cup reduced in a use amount of plastics and excellent in processing aptitude.SOLUTION: The base paper for a paper cup includes at least one heat seal layer on at least one surface of a paper base material; the heat seal layer includes an ionomer; the heat seal layer has a dry coating amount of 2 to 10 grams per square metre as a whole layer; the base paper for a paper cup has a basis weight of 80 grams per square metre to 400 grams per square metre; and the base paper for a paper cup has a latitudinal Taber bending resistance (JIS P-8125-2)) of 1 to 10 mN/m.SELECTED DRAWING: None

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