Joining device

A joining device, comprising:

• a holding portion that is configured to hold a shaft portion of a metal member, and that is configured to push the metal member toward one side in an axial direction of the shaft portion in a state in which the shaft portion is held by the holding portion;
• a supporting portion that is configured to support a thermoplastic resin member from a surface of the thermoplastic resin member at the one side in the axial direction;
• a heating portion that is configured to heat a surface at the one side in the axial direction of a distal end portion, which structures a portion of the metal member and is provided at the one side in the axial direction of the shaft portion, to a temperature at which a thermoplastic resin that structures the thermoplastic resin member, melts;
• a sleeve portion that is tubular, that is provided at an outer peripheral side of the holding portion, that is disposed so as to overlap with the distal end portion as seen from the axial direction, and that is configured to move in the axial direction relative to the holding portion;
• and
• an outer tube portion that is formed in a shape of a tube provided at an outer peripheral side of the sleeve portion and accommodating the metal member at an inner peripheral side thereof as seen from the axial direction, and that is configured to move in the axial direction relative to the sleeve portion, an end portion of the outer tube portion at the one side in the axial direction being configured to abut a surface of the thermoplastic resin member at another side in the axial direction.