Electrofusion joint and fusion method

An electrofusion joint comprising:

• a main body including a tubular shape and a joint receiving portion in which a pipe containing a thermoplastic resin can be inserted inside;
• a stopper portion disposed so as to project inward on an inner surface of the main body, the stopper portion being configured to regulate an insertion position of an end of the pipe when the pipe is inserted inside the joint receiving portion;
• a first heat generating section including a heating wire that is wound and arranged in the joint receiving portion;
• and
• a second heat generating section including a heating wire is wound so that wound parts are adjacent to each other, the heating wire being disposed in the stopper portion,
• wherein the first heat generating section includes one or a plurality of heat generating portions in which the heating wire is wound so that the wound parts are adjacent to each other, and a number of adjacent turns of the heating wire in the second heat generating section is larger than a number of adjacent turns of the heating wire in the heat generating portion adjacent to the second heat generating section.