The present invention provides a droplet ejection head which has the advantages of excellent dimension precision, excellent drug resistance, high quality printing for a long time and high reliability. The droplet ejection head (1) comprises: a substrate (20) having ejection liquid storing chambers (21); a nozzle plate (10) which is installed below the substrate (20) and is provided with nozzle holes (11); and a sealing plate (30) which is installed on the substrate (20) with a mode of covering the ejection liquid storing chambers (21), wherein the substrate (20) and the nozzle plate (10) are combined through a combining film (15) which is formed by a plasma polymerization method. The combining film (15) comprises an Si-skeleton which is constituted of constituent atoms containing siloxaneatoms and has an irregular atomic structure, and disengaging groups combined with the Si framework, wherein, the disengaging groups existing adjacently to the surface of combining film (15) are disengaged from the Si framework through endowing energy. Furthermore the bonding property represented on the combining film (15) is used for combining the substrate (20) and the nozzle plate (10).