A polycarbonate based resin composition comprising: a copolycarbonate resin including a repeating unit represented by the following Chemical Formula 1, a repeating unit represented by the following Chemical Formula 3, and a repeating unit represented by the following Chemical Formula 4; and a first polycarbonate resin including a repeating unit represented by the following Chemical Formula 2, and wherein: the copolycarbonate resin includes the respective repeating units so that a weight ratio of the repeating unit represented by Chemical Formula 1 and a sum of weights of the repeating units represented by Chemical Formulae 3 and 4 is 1:0.001 to 1:0.5: in Chemical Formula 1, R 1 to R 4 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, Z 1 is C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2, or CO, in Chemical Formula 2, R 5 to R 12 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, Z 2 and Z 3 are each independently C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2, or CO, and A is C 1-15 alkylene, in Chemical Formula 3, each of X 1 is independently C 1-10 alkylene, each of R 13 is independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and n is an integer of 10 to 200, in Chemical Formula 4, each of X 2 is independently C 1-10 alkylene, each of Y 1 is independently hydrogen, C 1-6 alkyl, halogen, hydroxy, C 1-6 alkoxy, or C 6-20 aryl, each of R 14 is independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and m is an integer of 10 to 200. a copolycarbonate resin including a repeating unit represented by the following Chemical Formula 1, a repeating unit represented by the following Chemical Formula 3, and a repeating unit represented by the following Chemical Formula 4; and a first polycarbonate resin including a repeating unit represented by the following Chemical Formula 2, and wherein: the copolycarbonate resin includes the respective repeating units so that a weight ratio of the repeating unit represented by Chemical Formula 1 and a sum of weights of the repeating units represented by Chemical Formulae 3 and 4 is 1:0.001 to 1:0.5: in Chemical Formula 1, R 1 to R 4 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, Z 1 is C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2, or CO, in Chemical Formula 2, R 5 to R 12 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, Z 2 and Z 3 are each independently C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2, or CO, and A is C 1-15 alkylene, in Chemical Formula 3, each of X 1 is independently C 1-10 alkylene, each of R 13 is independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and n is an integer of 10 to 200, in Chemical Formula 4, each of X 2 is independently C 1-10 alkylene, each of Y 1 is independently hydrogen, C 1-6 alkyl, halogen, hydroxy, C 1-6 alkoxy, or C 6-20 aryl, each of R 14 is independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and m is an integer of 10 to 200. R 1 to R 4 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, Z 1 is C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2, or CO, R 5 to R 12 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, Z 2 and Z 3 are each independently C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2, or CO, and A is C 1-15 alkylene, each of X 1 is independently C 1-10 alkylene, each of R 13 is independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and n is an integer of 10 to 200, each of X 2 is independently C 1-10 alkylene, each of Y 1 is independently hydrogen, C 1-6 alkyl, halogen, hydroxy, C 1-6 alkoxy, or C 6-20 aryl, each of R 14 is independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and m is an integer of 10 to 200.