Ink ejection device

An ink ejection device comprising a base material, a resin layer having at least one principal surface laminated to the base material to be in contact with the base material, and an ink flow path disposed such that an ink flows in contact with a part of the resin layer, wherein

• the resin layer contains carbon, oxygen, nitrogen and silicon, and
• the principal surface satisfies the following requirements (1) and (2):
• (1) the principal surface is in contact with the base material,
• (2) if an atomic concentration (atm %) of nitrogen, oxygen and silicon in the principal surface of the resin layer measured by X-ray photoelectron spectroscopy is represented by a principal surface N, a principal surface O and a principal surface Si, and an atomic concentration (atm %) of nitrogen, oxygen and silicon in an interior of the resin layer is represented by an interior N, an interior O and an interior Si, the principal surface O>the interior O and the principal surface N>0, and a ratio of the principal surface Si to the interior Si represented by the principal surface Si/the interior Si is 5 or more.