A polyisocyanate composition that is obtained from aliphatic diisocyanate including 1,6-diisocyanatohexane, the composition comprising: an isocyanurate group; and an iminooxadiazinedione group, wherein a ratio (A / (A + B)) of a molar amount (A) of an isocyanurate trimer represented by Formula (I) with respect to a total molar amount (A + B) of the molar amount (A) of the isocyanurate trimer and a molar amount (B) of iminooxadiazinedione trimer represented by Formula (II) is 0.1 to 0.9, and wherein a ratio (C) of a molar amount of a pentamer represented by Formula (III) with respect to a total molar amount of a pentamer of the aliphatic diisocyanate included in the polyisocyanate composition is A × B × 2 × 0.9 or more. (in Formula (I), R 11 , R 12 , and R 13 each independently represents a divalent aliphatic hydrocarbon group that may have an ester group,) (in Formula (II), R 21 , R 22 , and R 23 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group,) (in Formula (III), R 31 , R 32 , and R 33 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, X 31 is any one of groups represented by Formulae (IV-1) to (IV-3),) (in Formula (IV-1), R 411 and R 412 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, in Formula (IV-2), R 421 and R 422 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, in Formula (IV-3), R 431 and R 432 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, and the asterisk indicates a bonding point to R 32 ) an isocyanurate group; and an iminooxadiazinedione group, wherein a ratio (A / (A + B)) of a molar amount (A) of an isocyanurate trimer represented by Formula (I) with respect to a total molar amount (A + B) of the molar amount (A) of the isocyanurate trimer and a molar amount (B) of iminooxadiazinedione trimer represented by Formula (II) is 0.1 to 0.9, and wherein a ratio (C) of a molar amount of a pentamer represented by Formula (III) with respect to a total molar amount of a pentamer of the aliphatic diisocyanate included in the polyisocyanate composition is A × B × 2 × 0.9 or more. (in Formula (I), R 11 , R 12 , and R 13 each independently represents a divalent aliphatic hydrocarbon group that may have an ester group,) (in Formula (II), R 21 , R 22 , and R 23 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group,) (in Formula (III), R 31 , R 32 , and R 33 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, X 31 is any one of groups represented by Formulae (IV-1) to (IV-3),) (in Formula (IV-1), R 411 and R 412 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, in Formula (IV-2), R 421 and R 422 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, in Formula (IV-3), R 431 and R 432 each independently represents a divalent aliphatic hydrocarbon group that may include an ester group, and the asterisk indicates a bonding point to R 32 ) <EOS>