An ink-jet head has a flexible tube, a passage component, a tubular joint protruding from a surface of the passage component and fitted into the tube, and a cap covering a portion of the tube fitted with the joint. A hole is formed on the surface of the passage component. The cap includes a tubular portion having such an inside diameter as to allow the tube to pass therethrough, a protrusion protruding inward from an inner surface of the tubular portion, and an extending portion extending toward the hole from an end of the tubular portion confronting the surface of the passage component. An end of the protrusion is positioned between an inside diameter position and an outside diameter position of the portion of the tube fitted with the joint. A hook engageable with a peripheral edge of the hole is formed at the extending portion.