A resin structure comprising: a box-shape main body having a plurality of regions (R1, R2) dividing inside of the main body; and a plurality of lids (3, 4) assembled to the main body to cover corresponding each of the plurality of the regions (R1, R2), the main body having a first partition wall extending to separate between a pair of the regions (R1, R2) among the plurality of the regions (R1, R2), the pair of the regions (R1, R2) being adjacent each other, a first one of the plurality of the lids (3, 4) covering an upper end opening portion of one of the pair of the regions (R1, R2) and having a second partition wall provided at its edge portion to extend along the first partition wall, a second one of the plurality of the lids (3, 4) covering an upper end opening portion of the other of the pair of the regions (R1, R2) and having a third partition wall provided at its edge portion to extend along the first partition wall, the first partition wall and the second partition wall being located to overlap each other in a thickness direction of the first partition wall to form a multi-layer wall structure, and the first partition wall and the third partition wall being located to overlap each other in the thickness direction to form a multi-layer wall structure, upon the plurality of the lids (3, 4) being assembled to the main body, characterized in that the first partition wall has: a recessed first regulating portion receiving at least a part of the second partition wall, wherein the recessed first regulating portion is configured so that, during an assembly procedure, an upper end edge portion of the second partition wall is locked in an upper corner of the recess portion while the first lid is pivoted into an attached position to the main body and a locked portion engaging with a locking portion of the third partition wall. the main body having a first partition wall extending to separate between a pair of the regions (R1, R2) among the plurality of the regions (R1, R2), the pair of the regions (R1, R2) being adjacent each other, a first one of the plurality of the lids (3, 4) covering an upper end opening portion of one of the pair of the regions (R1, R2) and having a second partition wall provided at its edge portion to extend along the first partition wall, a second one of the plurality of the lids (3, 4) covering an upper end opening portion of the other of the pair of the regions (R1, R2) and having a third partition wall provided at its edge portion to extend along the first partition wall, the first partition wall and the second partition wall being located to overlap each other in a thickness direction of the first partition wall to form a multi-layer wall structure, and the first partition wall and the third partition wall being located to overlap each other in the thickness direction to form a multi-layer wall structure, upon the plurality of the lids (3, 4) being assembled to the main body, characterized in that the first partition wall has: a recessed first regulating portion receiving at least a part of the second partition wall, wherein the recessed first regulating portion is configured so that, during an assembly procedure, an upper end edge portion of the second partition wall is locked in an upper corner of the recess portion while the first lid is pivoted into an attached position to the main body and a locked portion engaging with a locking portion of the third partition wall.