Method of manufacturing and manufacturing apparatus for a ring member attached product

A method of manufacturing an assembled product that has a ring-shaped seal body attached to a ring-shaped attachment channel formed in an outer circumferential surface of a component main body, the method comprising:

• a supplying step that supplies a seal body to a guide member that has been detachably mounted on the component main body;
• a moving step that moves the seal body from a supplying position on the guide member to a position that faces the attachment channel;
• and
• an attachment step that guides the seal member that has moved to the facing position into the attachment channel,
• wherein the ring-shaped seal body is capable of elastic deformation and is provided with a ring-shaped inner circumferential portion, a first facing surface that faces a first inner wall out of a pair of inner walls of the attachment channel when the seal body is attached to the attachment channel, and a second facing surface that faces a second inner wall out of the pair of inner walls,
• the guide member includes a large diameter portion, which is positioned on the attachment channel side when the guide member is mounted on the component main body, and a tapered portion, which is continuous with the large diameter portion and narrows, and the guide member is positioned so that an axis of the tapered portion matches an axis of the component main body,
• the supplying step fits the ring-shaped inner circumferential portion of the ring-shaped seal portion onto the tapered portion of the guide member,
• the moving step moves the seal body toward the attachment channel with the inner circumferential portion of the seal body in contact with the tapered portion to expand an inner diameter of the ring-shaped inner circumferential portion to an outer diameter of the outer circumferential surface or larger, and
• when the ring-shaped seal body at the facing position is attached to the attachment channel, the attachment step guides attachment to the attachment channel while guiding the ring-shaped seal body that deforms from an expanded state to a reduced diameter due to elastic deformation.