An image recording paper medium comprising: a resin having a constitutional unit represented by General Formula and a constitutional unit represented by General Formula (2-1) and/or a constitutional unit represented by General Formula (2-2), wherein in the resin, a content of the constitutional unit represented by General Formula is 30% to 96% by mass, and a total content of the constitutional unit represented by General Formula (2-1) and the constitutional unit represented by General Formula (2-2) is 4% to 70% by mass, in General Formula , R 1 represents a hydrogen atom or methyl, L 1 represents a divalent linking group having 1 to 5 carbon atoms, and R 2 represents an alkyl group having 4 to 24 carbon atoms or an aryl group having 6 to 24 carbon atoms, and in General Formulae (2-1) and (2-2), R 3 represents a hydrogen atom or methyl, L 2 represents a single bond or a divalent linking group having 1 to 30 carbon atoms, and M 1 and M 2 each represent a hydrogen ion or a cation, wherein resins formed of the following constitutional units in the respective contents are excluded: and wherein the resin exists in a surface layer of the image recording paper medium or on a surface layer of the image recording paper medium or wherein the image recording paper medium further comprises a coating layer containing calcium carbonate and the resin is contained on the coating layer and/or in the coating layer. a resin having a constitutional unit represented by General Formula and a constitutional unit represented by General Formula (2-1) and/or a constitutional unit represented by General Formula (2-2), wherein in the resin, a content of the constitutional unit represented by General Formula is 30% to 96% by mass, and a total content of the constitutional unit represented by General Formula (2-1) and the constitutional unit represented by General Formula (2-2) is 4% to 70% by mass, in General Formula , R 1 represents a hydrogen atom or methyl, L 1 represents a divalent linking group having 1 to 5 carbon atoms, and R 2 represents an alkyl group having 4 to 24 carbon atoms or an aryl group having 6 to 24 carbon atoms, and in General Formulae (2-1) and (2-2), R 3 represents a hydrogen atom or methyl, L 2 represents a single bond or a divalent linking group having 1 to 30 carbon atoms, and M 1 and M 2 each represent a hydrogen ion or a cation, in General Formula , R 1 represents a hydrogen atom or methyl, L 1 represents a divalent linking group having 1 to 5 carbon atoms, and R 2 represents an alkyl group having 4 to 24 carbon atoms or an aryl group having 6 to 24 carbon atoms, and in General Formulae (2-1) and (2-2), R 3 represents a hydrogen atom or methyl, L 2 represents a single bond or a divalent linking group having 1 to 30 carbon atoms, and M 1 and M 2 each represent a hydrogen ion or a cation, wherein resins formed of the following constitutional units in the respective contents are excluded: and wherein the resin exists in a surface layer of the image recording paper medium or on a surface layer of the image recording paper medium or wherein the image recording paper medium further comprises a coating layer containing calcium carbonate and the resin is contained on the coating layer and/or in the coating layer. <EOS>