An electric connection box comprising: a housing comprising: an opening in a polygonal shape; and a plurality of side walls, each comprising a packing abutment end surface on an upper end; a lock protruding plate protruding from an outer surface of one of the plurality of side walls, the one defining a side of the opening; a lid comprising: a hanging wall having a hanging wall lower end surface; and a hook having a frame shape, the lid being configured to be rotationally fitted to the housing; a pair of lock portions configured to fix the lid to the plurality of side walls and provided on two positions on each of the lid and the housing, a rotation tip end portion of the lid being provided between the two positions; an annular packing configured to be attached on an inner peripheral side of the hanging wall; a step portion formed on the outer surface of each of the plurality of side walls and configured to, when the lid is attached to the housing, abut the hanging wall lower end surface; and a cutout portion provided on the hanging wall on a first portion of the lid, the first portion including the rotation tip end portion, wherein the hanging wall is configured to, when the lid is attached to the housing, cover an outer side of each of the plurality of side walls, wherein the hook is provided on the hanging wall and configured to be engaged with the lock protruding plate, wherein a rotational axis runs through the hook engaged with the lock protruding plate, wherein the lid is configured to be rotated to cover the opening about the rotational axis and to be fitted to the housing, and wherein the cutout portion is formed by cutting a lower tip end of the hanging wall such that a first clearance between the hanging wall lower end surface and the step portion at the first portion is larger than a second clearance between the hanging wall lower end surface and the step portion at a second portion of the lid when the lid is attached to the housing, the second portion being different from the first portion. a housing comprising: an opening in a polygonal shape; and a plurality of side walls, each comprising a packing abutment end surface on an upper end; a lock protruding plate protruding from an outer surface of one of the plurality of side walls, the one defining a side of the opening; a lid comprising: a hanging wall having a hanging wall lower end surface; and a hook having a frame shape, the lid being configured to be rotationally fitted to the housing; a pair of lock portions configured to fix the lid to the plurality of side walls and provided on two positions on each of the lid and the housing, a rotation tip end portion of the lid being provided between the two positions; an annular packing configured to be attached on an inner peripheral side of the hanging wall; a step portion formed on the outer surface of each of the plurality of side walls and configured to, when the lid is attached to the housing, abut the hanging wall lower end surface; and a cutout portion provided on the hanging wall on a first portion of the lid, the first portion including the rotation tip end portion, wherein the hanging wall is configured to, when the lid is attached to the housing, cover an outer side of each of the plurality of side walls, wherein the hook is provided on the hanging wall and configured to be engaged with the lock protruding plate, wherein a rotational axis runs through the hook engaged with the lock protruding plate, wherein the lid is configured to be rotated to cover the opening about the rotational axis and to be fitted to the housing, and wherein the cutout portion is formed by cutting a lower tip end of the hanging wall such that a first clearance between the hanging wall lower end surface and the step portion at the first portion is larger than a second clearance between the hanging wall lower end surface and the step portion at a second portion of the lid when the lid is attached to the housing, the second portion being different from the first portion.