There is provided an ink jet recording head which can efficiently prevent ink
from corroding an insulating film layer. A positive electrode is disposed on an
upper surface of the insulating film layer and a negative electrode is disposed
on a lower surface of the insulating film layer, which is referred to as a turnover
structure. There is no electrode between any two adjacent heater resistor portions.
As a result, high-density disposition of the heater resistor portions can be carried
out. The heater resistor portions are thermally oxidized, so that surfaces thereof
are changed into tantalum insulating films (surface oxidation films), which serve
as ink protection layers. A second insulating film layer is totally covered by
the heater resistor portions and the partition walls and is not exposed. Thus,
ink does not contact the second insulating film layer, and the second insulating
film layer is not corroded by ink.
