A method of manufacturing an outer joint member of a constant velocity universal joint, which is constructed by forming, through use of separate members, a cup section having track grooves formed at an inner periphery of the cup section and engageable with torque transmitting elements, and a shaft section formed at a bottom portion (12a2) of the cup section, and by welding a cup member forming the cup section and a shaft member forming the shaft section, the method comprising: forming the cup member and the shaft member of medium carbon steel; preparing, as the cup member, a cup member having a cylindrical portion (12a1) and the bottom portion (12a2) integrally formed by forging, and a joining end surface formed on an outer surface of the bottom portion (12a2) in a machining step after the forging; preparing, as the shaft member, a shaft member having a joining end surface to be joined to the joining end surface of the cup member, wherein the joining end surface is formed in a machining step; bringing the joining end surface of the cup member and the joining end surface of the shaft member into abutment against each other; welding the cup member and the shaft member by radiating a beam from an outer side of the cup member to an abutment portion between the cup member and the shaft member in a radial direction of the cup member, wherein a welding depth checking chamfer (51 a) is formed on a radially inner side of the joining end surface of the cup member or the joining end surface of the shaft member, and, after the welding, ultrasonic flaw detection-inspection is performed from a surface side of one of the cup member and the shaft member, the one of the cup member and the shaft member having the welding depth checking chamfer, characterized in that the shaft member has a bearing mounting surface at an outer periphery thereof and is formed to have a particular specification depending on a type of a vehicle in which the shaft member is to be assembled, while the joining end surface of the shaft member is formed to have an outer diameter set to an equal dimension that is fixed for each joint size, and the joining end surface of the cup member is formed to have an outer diameter set to an equal dimension that is fixed for each joint size, so that the cup member is combinable, for each joint size, with every one of the shaft members having a variety of the particular specifications to form the outer joint member. forming the cup member and the shaft member of medium carbon steel; preparing, as the cup member, a cup member having a cylindrical portion (12a1) and the bottom portion (12a2) integrally formed by forging, and a joining end surface formed on an outer surface of the bottom portion (12a2) in a machining step after the forging; preparing, as the shaft member, a shaft member having a joining end surface to be joined to the joining end surface of the cup member, wherein the joining end surface is formed in a machining step; bringing the joining end surface of the cup member and the joining end surface of the shaft member into abutment against each other; welding the cup member and the shaft member by radiating a beam from an outer side of the cup member to an abutment portion between the cup member and the shaft member in a radial direction of the cup member, wherein a welding depth checking chamfer (51 a) is formed on a radially inner side of the joining end surface of the cup member or the joining end surface of the shaft member, and, after the welding, ultrasonic flaw detection-inspection is performed from a surface side of one of the cup member and the shaft member, the one of the cup member and the shaft member having the welding depth checking chamfer, characterized in that the shaft member has a bearing mounting surface at an outer periphery thereof and is formed to have a particular specification depending on a type of a vehicle in which the shaft member is to be assembled, while the joining end surface of the shaft member is formed to have an outer diameter set to an equal dimension that is fixed for each joint size, and the joining end surface of the cup member is formed to have an outer diameter set to an equal dimension that is fixed for each joint size, so that the cup member is combinable, for each joint size, with every one of the shaft members having a variety of the particular specifications to form the outer joint member.