A method for manufacturing a joined member by joining a first member formed of a metal material having a possibility of undergoing quenching and a second member formed of a metal material, the method comprising: a contact-placing step of placing the first member and the second member with a joint target portion (Df) of the first member and a joint target portion (Ef) of the second member being in contact with each other; a welding step of welding the joint target portions (Df, Ef) of the first member and the second member by heating, wherein the welding step is a step of performing resistance welding of the joint target portions (Df, Ef) of the first member and the second member by passing an electric current between a first electrode brought in contact with the first member and a second electrode brought in contact with the second member, with simultaneous application of pressure to the joint target portions (Df, Ef); a crack-inhibition step of subjecting the first member after the welding step to a process for inhibiting occurrence of cracks, wherein the crack-inhibition step includes heating a portion where the first member and the second member have been welded to each other, by passing an electric current between the first electrode and second electrode in order to achieve preliminary tempering; and, being characterised by the following steps: an electromagnetic heating step of tempering a portion where the first member and the second member have been welded to each other by electromagnetic heating; wherein the electromagnetic heating step is achieved by induction heating using an induction heating coil, and the electromagnetic heating step includes: placing the induction heating coil in a vicinity of a first edge (Sn) forming an outer periphery of a joint surface between the first member and the second member; and tempering the joint surface (Jf) on a side of an opposite edge (Sf) opposed to the first edge (Sn) first and then tempering the joint surface (Jn) on the side of the first edge (Sn) with an output from the induction heating coil reduced to a level lower than that used to temper the joint surface (Jf) on the side of the opposite edge (Sf). a contact-placing step of placing the first member and the second member with a joint target portion (Df) of the first member and a joint target portion (Ef) of the second member being in contact with each other; a welding step of welding the joint target portions (Df, Ef) of the first member and the second member by heating, wherein the welding step is a step of performing resistance welding of the joint target portions (Df, Ef) of the first member and the second member by passing an electric current between a first electrode brought in contact with the first member and a second electrode brought in contact with the second member, with simultaneous application of pressure to the joint target portions (Df, Ef); a crack-inhibition step of subjecting the first member after the welding step to a process for inhibiting occurrence of cracks, wherein the crack-inhibition step includes heating a portion where the first member and the second member have been welded to each other, by passing an electric current between the first electrode and second electrode in order to achieve preliminary tempering; and, an electromagnetic heating step of tempering a portion where the first member and the second member have been welded to each other by electromagnetic heating; wherein the electromagnetic heating step is achieved by induction heating using an induction heating coil, and the electromagnetic heating step includes: placing the induction heating coil in a vicinity of a first edge (Sn) forming an outer periphery of a joint surface between the first member and the second member; and tempering the joint surface (Jf) on a side of an opposite edge (Sf) opposed to the first edge (Sn) first and then tempering the joint surface (Jn) on the side of the first edge (Sn) with an output from the induction heating coil reduced to a level lower than that used to temper the joint surface (Jf) on the side of the opposite edge (Sf).