An ink unit having: an ink utilized for an inkjet recorder; and a wetted member that contacts with the ink, wherein the ink includes a pigment dispersedly held in a medium, and the pigment contains particles having a size of 200 nm or larger in 2 volume percent or less, and wherein a principal component of the ink-wetted member is [1] a compound of specific hydrotalcite; [2] a fatty acid and/or a fatty acid derivative; [3 ] a phenolic antioxidant having an isocyanurate skeleton; or [4] a polyolefin including an alkyl-substituted benzylidene sorbitol.