Abstract: An ink-jet recording paper sheet for ink-jet recording with on-demand type heads having a multi-nozzle comprises a recording layer formed on one face of a base paper sheet to give a basis weight of the recording paper of from 150 to 250 g/m.sup.2 with a coating color which contains a pigment and a binder, the pigment containing synthetic silica having a BET specific surface area ranging from 250 to 500 m.sup.2 /g at a content of not less than 80% by weight of the pigment, the binder containing casein and styrene-butadiene rubber, the weight ratio of the pigment to the binder ranging from 1.8 to 2.4, the recording layer having coating solid in an amount ranging from 15 to 25 g/m.sup.2, and surface roughness by ten-point-hight of the recording layer ranging from 0.5 to 5 .mu.m, and the paper sheet being curled at a maximum curling height ranging from 0 to 20 mm in A4 paper size with the printed face upside.