Electrically conductive adhesive agent, joined body, and joint

A method of forming a joint, comprising:

• heating an electrically conductive adhesive agent,
• wherein the electrically conductive adhesive agent comprises an electrically conductive metallic powder including Sn, a thermosetting resin, an acid-anhydride-based hardening agent, and an organic acid,
• wherein the electrically conductive metallic powder contains Sn of 85 weight % or more based on 100 weight % of the electrically conductive metallic powder,
• wherein the electrically conductive adhesive agent contains 88 through 90 weight % of the electrically conductive metallic powder based on 100 weight % of the electrically conductive adhesive agent,
• wherein the electrically conductive adhesive agent is heated at a temperature of 150 degrees C. or more and less than a melting point of the electrically conductive metallic powder to cause the electrically conductive metallic powder and the organic acid to react and to produce a hardening accelerator comprised of an organic acid metal salt,
• wherein, prior to heating, the electrically conductive adhesive agent does not include a hardening accelerator, and
• wherein the joint is formed without melting the electrically conductive metallic powder.