1. An inkjet printing paper of noncoated type produced from pulp through a paper machine, said paper comprising filler, which has calcium carbonate as its main component, wherein said filler contains ash of 10 to 30 weight % as defined in JIS P 8128 and wherein said paper has Stockigt sizing degree of 0.001 to 0.05 sec/g/m 2 according to JIS P 8122