A closed-type coating head that can handle a wide range of film thicknesses and viscosities. The CED coater has a structure that can be easily disassembled, cleaned, and assembled, yet it ensures mechanical reproducibility. In addition, it supports short-time liquid change by head replacement. Coating control can be performed by detecting the hydraulic pressure, and the coating width can be adjusted during coating. The seal is precision molded to prevent liquid leakage. The patented pressure-resistant seal shape increases the internal pressure and realizes high-accuracy coating.