[en] The second-class current was taken into account for the analysis of the non-leptonic and radiative decays of hyperons. It is assumed that the second-class current transforms like an octet of the SU(3). Since the second-class currents have CP property opposite to first-class currents, the octet pieces of current products are even under the CP operation. The amplitude for the non-leptonic decay of hyperons in written by the soft pion technique. The commutation relations of the parity conserving part and the violating part of the Hamiltonian for the non-leptonic decay of hyperons are satisfied in the presence of second-class currents if it is assumed that they are left-handed as first-class currents. When some Born terms are neglected, both the S-wave and the P-wave amplitudes satisfy the Lee-Sugawara relation. In the absence of second-class currents, it is not possible to fit both of them simultaneously. Under the existence of second-class currents the situation is altered. From general invariance grounds, the independent S-wave amplitude and the P-wave amplitude were obtained, and were in good agreement with experimental results. The radiative weak decay of hyperons is also studied. (Kato, T.)