Resin structure

A resin structure comprising:

• a first resin body having an annular first side wall portion;
• a second resin body having a second side wall portion;
• and
• a third resin body having an annular third side wall portion,
• wherein the second resin body is assembled to the first resin body, such that an upper edge of the second side wall portion and at least a portion of an annular lower edge of the first side wall portion in a circumferential direction are aligned,
• wherein the third resin body is assembled to the second resin body, such that an annular upper edge of the third side wall portion and at least a lower edge of the second side wall portion are aligned,
• wherein one resin both of the first resin body and the third resin body includes an extension piece extending toward the other resin body of the first resin body and the third resin body across an outer side of the second side wall portion,
• wherein the other resin body includes a locking portion that locks a distal end portion of the extension piece, and
• wherein the second side wall portion of the second resin body includes a holding portion that holds a portion of the extension piece located outside the second side wall portion.