Patent ID: 7887162

Claim:
A liquid discharge head, comprising: a substrate provided with an energy generating element for generating energy to be used for discharging liquid from a discharge port corresponding to the energy generating element; a passage wall member provided with a wall of passage of liquid communicated with the discharge port, provided on the substrate, wherein the passage wall member is a cured product of photosensitive resin comprising: an epoxy resin (A) represented by Formula (1); an epoxy resin (B) having an epoxy equivalent of 220 or less and having twice or more epoxy groups in a molecule than epoxy groups of the epoxy resin (A); and a photocationic polymerization initiator (C), wherein: the epoxy resins (A) and (B) constitute main components of the photosensitive resin; and a weight of the epoxy resin (A) is 40% or more and a weight of the epoxy resin (B) is 30% or more with respect to a total weight of the epoxy resins (A) and (B): where: R represents a hydrogen atom, a methyl group, an ethyl group, a propyl group, or a t-butyl group; n represents an integer of 0 or more and 4 or less; and m represents an integer of 1 or more and 3 or less.