A compound represented by Chemical Formula 1 for an organic optoelectronic device: wherein, in Chemical Formula 1, X 1 to X 3 are independently N or CR a, at least two of X 1 to X 3 are N, Y 1 is O or S, Ar is a substituted or unsubstituted C6 to C30 aryl group, R a and R 1 to R 3 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a combination thereof, R 4 to R 8 are independently hydrogen, deuterium, a cyano group, a nitro group, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted quinolinyl group, a substituted or unsubstituted isoquinolinyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof, R 4 to R 8 are independently present or adjacent groups thereof are linked with each other to provide a substituted or unsubstituted aliphatic monocyclic ring, a substituted or unsubstituted aliphatic polycyclic ring, a substituted or unsubstituted aromatic monocyclic ring, a substituted or unsubstituted aromatic polycyclic ring, a substituted or unsubstituted heteroaromatic monocyclic ring or a substituted or unsubstituted heteroaromatic polycyclic ring, wherein a heteroaromatic polycyclic ring is represented by Chemical Formula A: wherein, in Chemical Formula A, Y 2 is O or S, and * is a linking point with a substituted or unsubstituted phenylene, n1 to n3 are independently an integer of 0 to 2, in case of n1 +n2+n3=0, adjacent groups of R 4 to R 8 are linked with each other to provide a substituted or unsubstituted aliphatic monocyclic ring, a substituted or unsubstituted aliphatic polycyclic ring, a substituted or unsubstituted aromatic monocyclic ring, a substituted or unsubstituted aromatic polycyclic ring, a substituted or unsubstituted heteroaromatic monocyclic ring or a substituted or unsubstituted heteroaromatic polycyclic ring, wherein a heteroaromatic polycyclic ring represented by Chemical Formula A, and the "substituted" refers to replacement of at least one hydrogen by deuterium, a C1 to C20 alkyl group, a C6 to C30 aryl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted quinolinyl group, a substituted or unsubstituted isoquinolinyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group. wherein, in Chemical Formula 1, X 1 to X 3 are independently N or CR a, at least two of X 1 to X 3 are N, Y 1 is O or S, Ar is a substituted or unsubstituted C6 to C30 aryl group, R a and R 1 to R 3 are independently hydrogen, deuterium, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a combination thereof, R 4 to R 8 are independently hydrogen, deuterium, a cyano group, a nitro group, a substituted or unsubstituted C1 to C10 alkyl group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted quinolinyl group, a substituted or unsubstituted isoquinolinyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, or a combination thereof, R 4 to R 8 are independently present or adjacent groups thereof are linked with each other to provide a substituted or unsubstituted aliphatic monocyclic ring, a substituted or unsubstituted aliphatic polycyclic ring, a substituted or unsubstituted aromatic monocyclic ring, a substituted or unsubstituted aromatic polycyclic ring, a substituted or unsubstituted heteroaromatic monocyclic ring or a substituted or unsubstituted heteroaromatic polycyclic ring, wherein a heteroaromatic polycyclic ring is represented by Chemical Formula A: wherein, in Chemical Formula A, Y 2 is O or S, and * is a linking point with a substituted or unsubstituted phenylene, n1 to n3 are independently an integer of 0 to 2, in case of n1 +n2+n3=0, adjacent groups of R 4 to R 8 are linked with each other to provide a substituted or unsubstituted aliphatic monocyclic ring, a substituted or unsubstituted aliphatic polycyclic ring, a substituted or unsubstituted aromatic monocyclic ring, a substituted or unsubstituted aromatic polycyclic ring, a substituted or unsubstituted heteroaromatic monocyclic ring or a substituted or unsubstituted heteroaromatic polycyclic ring, wherein a heteroaromatic polycyclic ring represented by Chemical Formula A, and the "substituted" refers to replacement of at least one hydrogen by deuterium, a C1 to C20 alkyl group, a C6 to C30 aryl group, a substituted or unsubstituted pyridinyl group, a substituted or unsubstituted quinolinyl group, a substituted or unsubstituted isoquinolinyl group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group.