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 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 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 of welding a first zone (35a; 35Ba1, 35Ba2) of the joint interface 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; and after the first welding step, a second welding step of welding a second zone of the joint interface 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 left without being welded by the first welding step. fixing 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 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 of welding a first zone (35a; 35Ba1, 35Ba2) of the joint interface 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; and after the first welding step, a second welding step of welding a second zone of the joint interface 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 left without being welded by the first welding step. a first welding step of welding a first zone (35a; 35Ba1, 35Ba2) of the joint interface 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; and after the first welding step, a second welding step of welding a second zone of the joint interface 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 left without being welded by the first welding step.