An ink composition for inkjet of the present invention comprises: a solvent, a pigment containing a first powder having a first charge on its surface in a solvent, an ionic polymer having a second charge opposite to the first charge, and a multivalent ion having the first charge. The surface tension of the ink composition is 53 mN/m or less.本發明之噴墨用印墨組成物係包含:溶劑,含有在前述溶劑中於表面帶有第1電荷之第1粉末的顏料,具有與第1電荷相反之第2電荷的離子性高分子,及具有第1電荷之多價離子。印墨組成物之表面張力為53mN/m以下。