FIGS. 7A to 7C are drawings for explaining the positional relation between the movable member 31 and the second liquid flow path 16 as explained above, wherein FIG. 7A is a top plan view of the partition wall 30, the movable member 31, and their neighborings, FIG. 7B a top plan view of the second liquid flow path 16 when the partition wall 30 is taken away, and FIG. 7C a drawing to schematically s