Clearance filling structure of accommodation box, electric connection box, and wire harness

1. A clearance filling structure of an accommodation box, the clearance filling structure comprising:

a clearance filling portion that is provided on one of a casing including an accommodation chamber and an opening communicated with the accommodation chamber, and an accommodation target object to be inserted from the opening and accommodated into the accommodation chamber, and is configured to suppress backlash between the accommodation chamber and the accommodation target object at an accommodation completion position, wherein

the accommodation chamber includes an internal wall surface to be disposed to face the accommodation target object at an interval when accommodation of the accommodation target object ends,

the accommodation target object includes an external wall surface to be disposed to face the internal wall surface at an interval when accommodation to the accommodation chamber ends,

one wall surface of the internal wall surface and the external wall surface that are disposed to face each other includes, as the clearance filling portion, a plurality of projecting portions that project toward another wall surface thereof, and extend along an insertion direction of the accommodation target object to the accommodation chamber, and contact the other wall surface,

the projecting portions are formed so that a demolding direction from a molding die forming the one wall surface corresponds to an extending direction, and the one wall surface is divided into a plurality of regions along the insertion direction, and

respective centers of the projecting portions, in the insertion direction, are respectively provided in mutually different regions of the plurality of regions.

2. The clearance filling structure of an accommodation box according to claim 1 , wherein

the projecting portions are shifted from each other in an orthogonal direction to the insertion direction.

3. The clearance filling structure of an accommodation box according to claim 1 , wherein

the projecting portions are disposed end by end in the insertion direction.

4. The clearance filling structure of an accommodation box according to claim 1 , wherein

the projecting portions each comprise a peak that is configured to contact the other wall surface, the peak having a height in a direction in which the projecting portions project toward the other wall surface, and

the height of the peak increases along the insertion direction.

5. An electric connection box comprising:

a casing that is configured to accommodate one end side of an electric wire, thereinside, and to draw out another end side of the electric wire to an outside, and includes an accommodation chamber and an opening communicated with the accommodation chamber;

an accommodation target object to be inserted from the opening and accommodated into the accommodation chamber; and

a clearance filling portion that is provided on one of the accommodation chamber and the accommodation target object, and is configured to suppress backlash between the accommodation chamber and the accommodation target object at an accommodation completion position, wherein

the accommodation chamber includes an internal wall surface to be disposed to face the accommodation target object at an interval when accommodation of the accommodation target object ends,

the accommodation target object is an electronic component holding member configured to accommodate and hold an electronic component to be electrically connected to one end side of the electric wire, and includes an external wall surface to be disposed to face the internal wall surface at an interval when accommodation to the accommodation chamber ends,

one wall surface of the internal wall surface and the external wall surface that are disposed to face each other includes, as the clearance filling portion, a plurality of projecting portions that project toward another wall surface thereof, and extend along an insertion direction of the accommodation target object to the accommodation chamber, and contact the other wall surface, and

the projecting portions are formed so that a demolding direction from a molding die forming the one wall surface corresponds to an extending direction, and the one wall surface is divided into a plurality of regions along the insertion direction, and

respective centers of the projecting portions, in the insertion direction, are respectively provided in mutually different regions of the plurality of regions.

6. A wire harness comprising:

an electric wire;

a casing that is configured to accommodate one end side of the electric wire, thereinside, and to draw out another end side of the electric wire to an outside, and includes an accommodation chamber and an opening communicated with the accommodation chamber;

an accommodation target object to be inserted from the opening and accommodated into the accommodation chamber; and

a clearance filling portion that is provided on one of the accommodation chamber and the accommodation target object, and is configured to suppress backlash between the accommodation chamber and the accommodation target object at an accommodation completion position, wherein

the accommodation chamber includes an internal wall surface to be disposed to face the accommodation target object at an interval when accommodation of the accommodation target object ends,

the accommodation target object is an electronic component to be electrically connected to one end side of the electric wire, or an electronic component holding member configured to accommodate and hold the electronic component, and includes an external wall surface to be disposed to face the internal wall surface at an interval when accommodation to the accommodation chamber ends,

one wall surface of the internal wall surface and the external wall surface that are disposed to face each other includes, as the clearance filling portion, a plurality of projecting portions that project toward another wall surface thereof, and extend along an insertion direction of the accommodation target object to the accommodation chamber, and contact the other wall surface,

the projecting portions are formed so that a demolding direction from a molding die forming the one wall surface corresponds to an extending direction, and the one wall surface is divided into a plurality of regions along the insertion direction, and

respective centers of the projecting portions, in the insertion direction, are respectively provided in mutually different regions of the plurality of regions.