Provided is a polyisocyanate mixture including: a triisocyanate compound (A) represented by Formula (I); and polyisocyanate (B) obtained from at least one diisocyanate selected from the group consisting of aliphatic diisocyanate, alicyclic diisocyanate, and aromatic diisocyanate. (In Formula (1), a plurality of Y1's each independently represent a single bond or a divalent hydrocarbon group having 1 to 20 carbon atoms which may have an ester structure and/or an ether structure. A plurality of Y1's may be the same as or different from one another. R1 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 12 carbon atoms.)