A liquid jet head comprising: a main body part having: a liquid jet head chip including a liquid flow channel adapted to channel a liquid, and being adapted to jet the liquid; and a cooling section including a refrigerant flow channel adapted to channel a refrigerant; an inflow side connection unit selectively attachable to and detachable from the main body part on an upstream side in the liquid flow channel and an upstream side in the refrigerant flow channel; and an outflow side connection unit selectively attachable to and detachable from the main body part on a downstream side in the liquid flow channel and a downstream side in the refrigerant flow channel, wherein a first inflow side cover unit including a liquid inflow tube branched into a liquid relay path connectable to a liquid inflow port of the liquid flow channel and a refrigerant relay path connectable to a refrigerant inflow port of the refrigerant flow channel, and a second inflow side cover unit separately including a liquid inflow tube connected to the liquid relay path connectable to the liquid inflow port and a refrigerant inflow tube connected to the refrigerant relay path connectable to the refrigerant inflow port of the refrigerant flow channel are selectable as the inflow side connection unit, a first outflow side cover unit including a liquid outflow tube where a liquid relay path connectable to a liquid outflow port of the liquid flow channel and a refrigerant relay path connectable to a refrigerant outflow port of the refrigerant flow channel are merged with each other, and a second outflow side cover unit separately including a liquid outflow tube connected to the liquid relay path connectable to the liquid outflow port and a refrigerant outflow tube connected to the refrigerant relay path connectable to the refrigerant outflow port of the refrigerant flow channel are selectable as the outflow side connection unit, and the liquid jet head is adapted to be switched between a first mode, in which the first inflow side cover unit is selected as the inflow side connection unit and the first outflow side cover unit is selected as the outflow side connection unit, and a second mode, in which the second inflow side cover unit is selected as the inflow side connection unit and the second outflow side cover unit is selected as the outflow side connection unit. a main body part having: a liquid jet head chip including a liquid flow channel adapted to channel a liquid, and being adapted to jet the liquid; and a cooling section including a refrigerant flow channel adapted to channel a refrigerant; a liquid jet head chip including a liquid flow channel adapted to channel a liquid, and being adapted to jet the liquid; and a cooling section including a refrigerant flow channel adapted to channel a refrigerant; an inflow side connection unit selectively attachable to and detachable from the main body part on an upstream side in the liquid flow channel and an upstream side in the refrigerant flow channel; and an outflow side connection unit selectively attachable to and detachable from the main body part on a downstream side in the liquid flow channel and a downstream side in the refrigerant flow channel, wherein a first inflow side cover unit including a liquid inflow tube branched into a liquid relay path connectable to a liquid inflow port of the liquid flow channel and a refrigerant relay path connectable to a refrigerant inflow port of the refrigerant flow channel, and a second inflow side cover unit separately including a liquid inflow tube connected to the liquid relay path connectable to the liquid inflow port and a refrigerant inflow tube connected to the refrigerant relay path connectable to the refrigerant inflow port of the refrigerant flow channel are selectable as the inflow side connection unit, a first outflow side cover unit including a liquid outflow tube where a liquid relay path connectable to a liquid outflow port of the liquid flow channel and a refrigerant relay path connectable to a refrigerant outflow port of the refrigerant flow channel are merged with each other, and a second outflow side cover unit separately including a liquid outflow tube connected to the liquid relay path connectable to the liquid outflow port and a refrigerant outflow tube connected to the refrigerant relay path connectable to the refrigerant outflow port of the refrigerant flow channel are selectable as the outflow side connection unit, and the liquid jet head is adapted to be switched between a first mode, in which the first inflow side cover unit is selected as the inflow side connection unit and the first outflow side cover unit is selected as the outflow side connection unit, and a second mode, in which the second inflow side cover unit is selected as the inflow side connection unit and the second outflow side cover unit is selected as the outflow side connection unit.