Fluorine-containing novolac resin, fluorine-containing surfactant, fluorine-containing surfactant composition, and resin composition

A fluorine-containing novolac resin represented by General formula (I):

• wherein in the formula, R represents a fluorinated-alkyl-containing substituent, R′ represents a hydrogen atom or a methyl group, R″ represents a hydrogen atom or a non-fluorinated substituent, —X— represents any one of the four following types of linking groups:
• —X′ represents any one of three following types of substituents:
• wherein n represents 0 or an integer of 1 or more, m represents an integer of 1 or more, and n+m is an integer of 2 or more,
• the fluorine-containing novolac resin comprising a (meth)acryloyl group having a structure in which a part of or all hydrogen atoms of the hydroxyl groups shown in the formula (I) representing the fluorine-containing novolac resin are substituted with a structure represented by General formula (II) as follows:
• wherein in the formula, R′ represents a hydrogen atom or a methyl group, A represents a divalent to quadrivalent linking group which is any one of a hydrocarbon group having the carbon number of 2 to 5, an ethylene oxide chain having the number of ethylene units of 2 to 4, and a propylene oxide chain having the number of propylene units of 2 to 4, and f represents an integer of 1 to 3.