The hypothesis on quark nature of the leptons is proposed. Leptons are compacted <$E q bar sup 3>-systems. It ensures the equality of modules for the electric charges of the proton and the electron. The classification of particles based on the <$E U(N sub f ,~g)~times~SU(3,~c)~times~SU(4,~fs)~times~O(3)>-group is proposed at arbitrary quantity <$E N sub f> of the quark generations. The <$E U(N sub f ,~g>-group corresponds to the quark generations, the <$E SU(3,~c)>-group describes the color variables, the <$E SU(4,~fs)>-group corresponds to the variables in the spin (s) and flavor (f) spaces, and the O(3)-group describes the orbital excitations of quarks. In consequence of the Pauli principle leptons consist of antiquarks from 3 different generations. Minimal quantity of leptons with definite electric charge equal 20. Excited double charged <$E l sup {- ^ -}>-leptons and <$E l Bar sup ++>-antileptons with the <$E J sup p~=~1 sup + over 2> and <$E J sup p~=~1 sup - over 2> are predicted, respectively. They can be resonances in <$E e sup - ,~pi sup ->, <$E e sup - ,~K sup ->, <$E e sup + ,~pi sup +>, <$E e sup + ,~K sup +>, <$E mu sup - ,~pi sup ->, <$E mu sup - ,~K sup ->, <$E mu sup + ,~pi sup +>, <$E mu sup + ,~K sup +>-systems.

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