A multi-nozzle ink jet head having a diaphragm that effectively utilizes the force generated by thin-film piezoelectric elements is disclosed. A first antenna has a first antenna element positioned outside a first corner of a planar, rectangular ground plane and a second antenna element positioned outside a second corner of the ground plane that is diagonally across from the first corner. The disclosure contemplates that the beneficial effects of the induced magnetic fields are the result of the interaction of certain constituents of the blood with the magnetic fields. The gas replacing system supplies a purge gas into the casing to replace a gas inside the casing with the purge gas. The accommodation container has a liquid storage section that stores a liquid which can dissolve a solute component of the solution.