A method of manufacturing a spark plug , the spark plug comprising an electrode (30; 30B; 20C) provided with a noble metal tip (39; 39B; 29C) and an electrode body (31; 31B, 33B; 21C), the manufacturing method comprising: fixing (S30) the noble metal tip (39; 39B; 29C) to the electrode body (31; 33B; 21C), with a first surface of the noble metal tip (39; 39B; 29C) being held in contact with a second surface of the electrode body (31; 33B; 21C) to define a joint interface (BS) of the first surface and the second surface ; and welding (S40, S60) the noble metal tip (39; 39B; 29C) to the electrode body (31; 33B; 21C), characterized in that the welding comprises two separate welding steps (S40, S60) : a first welding step (S40) of welding a first zone (35a; 35Ba1, 35Ba2) of the joint interface (BS) by continuously irradiating with a laser beam while moving an irradiation position of the laser beam along the joint interface, the first zone excluding at least a part of a region (FP; FPB) of the noble metal tip (39; 39B; 29C) fixed by the fixing (S30); and after the first welding step (S40), a second welding step (S60) of welding a second zone of the joint interface (BS) by continuously irradiating with a laser beam while moving an irradiation position of the laser beam along the joint interface, the second zone being at least partially displaced in position from the first zone (35a; 35Ba1, 35Ba2) and including an unwelded portion of the joint interface (BS) left without being welded by the first welding step (S40). fixing (S30) the noble metal tip (39; 39B; 29C) to the electrode body (31; 33B; 21C), with a first surface of the noble metal tip (39; 39B; 29C) being held in contact with a second surface of the electrode body (31; 33B; 21C) to define a joint interface (BS) of the first surface and the second surface ; and welding (S40, S60) the noble metal tip (39; 39B; 29C) to the electrode body (31; 33B; 21C), characterized in that the welding comprises two separate welding steps (S40, S60) : a first welding step (S40) of welding a first zone (35a; 35Ba1, 35Ba2) of the joint interface (BS) by continuously irradiating with a laser beam while moving an irradiation position of the laser beam along the joint interface, the first zone excluding at least a part of a region (FP; FPB) of the noble metal tip (39; 39B; 29C) fixed by the fixing (S30); and after the first welding step (S40), a second welding step (S60) of welding a second zone of the joint interface (BS) by continuously irradiating with a laser beam while moving an irradiation position of the laser beam along the joint interface, the second zone being at least partially displaced in position from the first zone (35a; 35Ba1, 35Ba2) and including an unwelded portion of the joint interface (BS) left without being welded by the first welding step (S40). a first welding step (S40) of welding a first zone (35a; 35Ba1, 35Ba2) of the joint interface (BS) by continuously irradiating with a laser beam while moving an irradiation position of the laser beam along the joint interface, the first zone excluding at least a part of a region (FP; FPB) of the noble metal tip (39; 39B; 29C) fixed by the fixing (S30); and after the first welding step (S40), a second welding step (S60) of welding a second zone of the joint interface (BS) by continuously irradiating with a laser beam while moving an irradiation position of the laser beam along the joint interface, the second zone being at least partially displaced in position from the first zone (35a; 35Ba1, 35Ba2) and including an unwelded portion of the joint interface (BS) left without being welded by the first welding step (S40). <EOS>