To prevent the damage of the ink supply member connected to a liquid jet head unit when the liquid jet head unit mounted on a head loading member is detached.

When the liquid jet head unit mounted on a head loading member 200 is detached, the ink supply member connected to the liquid jet head unit is separated by a piping attaching and deteching mechanism 234 and subsequently released from the holding by a head holding mechanism 237. Therefore, the ink supply member is separated from the liquid jet head unit, which is held to the head loading member 200 by the head holding mechanism 237, by the piping attaching and detaching mechanism 234 and, since the ink supply member is not separated from the liquid jet head unit in an improper direction, the damage of the ink supply member at a time of the detachment of the liquid jet head unit can be prevented.