The utility model provides a derailleur and connection structure of transfer case and vehicle that has it, the derailleur is used for establishing in order to be connected derailleur assembly and transfer case assembly on the suspension support with the connection structure of transfer case, and the derailleur includes with the connection structure of transfer case: connecting portion form to theplate body, the first connection of one side of connecting portion formation face, and the opposite side forms the second and connects the face, is equipped with on the connecting portion to be used for the first through -hole with transfer case assembly input shaft matched with, and upwards being equipped with in week of connecting portion is used for a plurality of first mounting hole continuouswith the derailleur assembly, first casing forms to the tubbiness, and the one end of first casing links to each other with connecting portion, and the other end of first casing is equipped with thesecond mounting hole of a plurality of spaced apart settings along radially outwards extending into the extension on, the second casing forms and to cooperate with derailleur assembly output shaft inorder being used for for the tubbiness. According to the utility model discloses the connection structure of derailleur and transfer case has realized transitional coupling and suspension support function, and intensity is high.