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Packing according to the invention includes a cylinder portion which extends in a direction of an axis, and in which a diameter of a portion in one end side is increased when the packing is fitted to an object. The cylinder portion includes a fold portion which has a tortuous periphery in a cross se

Packing according to the invention includes a cylinder portion which extends in a direction of an axis, and in which a diameter of a portion in one end side is increased when the packing is fitted to an object. The cylinder portion includes a fold portion which has a tortuous periphery in a cross section orthogonal to the direction of the axis.

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What is claimed is: 1. A battery packing, comprising: a cylinder portion having first and second ends which extends in a direction of an axis, and in which a diameter of a portion in the second end is increased when the packing is fitted to an object, wherein the cylinder portion includes a fold po

What is claimed is: 1. A battery packing, comprising: a cylinder portion having first and second ends which extends in a direction of an axis, and in which a diameter of a portion in the second end is increased when the packing is fitted to an object, wherein the cylinder portion includes a fold portion which has a tortuous periphery in a cross section orthogonal to the direction of the axis, and wherein when the packing is fitted to the object, a terminal member for a battery is inserted in the cylinder portion, and a diameter of a portion in the second end in the cylinder portion is increased. 2. The battery packing according to claim 1, wherein the fold portion is formed all over the portion whose diameter is increased in the cylinder portion. 3. The battery packing according to claim 1, further comprising a flange portion which extends in a direction orthogonal to the direction of the axis, from the first end of the cylinder portion, a diameter of the first end being not increased when the packing is fitted to the object. 4. The battery packing according to claim 1, wherein the fold portion is formed such that a peripheral length of the fold portion in the cross section orthogonal to the direction of the axis is increased toward the second end of the cylinder portion. 5. The battery packing according to claim 1, wherein the cylinder portion is formed such that a diameter of a virtual circle circumscribing the cylinder portion in the cross section orthogonal to the direction of the axis is uniform irrespective of a distance from one end whose diameter is not increased when the packing is fitted to the object, or the diameter of the virtual circle is decreased toward one end whose diameter is increased when the packing is fitted to the object. 6. The battery packing according to claim 1, wherein the cylinder is made of a plastic material. 7. A battery packing, comprising: a cylinder portion having first and second ends and extending in a direction of an axis, a diameter of a portion of the second end of the cylinder portion increasing when fitted to an object, the cylinder portion includes a fold portion which has a tortuous periphery in a cross section orthogonal to the direction of the axis; and a flange portion having a substantially flat ring shape which extends from the first end of the cylinder portion in a direction orthogonal to the axis, and wherein when the packing is fitted to the object, a terminal member for a battery is inserted in the cylinder portion, and a diameter of a portion in the second end in the cylinder portion is increased. 8. The battery packing according to claim 7, wherein the cylinder portion and the flange are made of a resin. 9. The battery packing according to claim 7, wherein the cylinder portion and the flange are made of nylon. 10. The battery packing according to claim 7, wherein the flange portion serves as insulation for the battery. 11. The battery packing according to claim 7, further comprising a pair of outside portions provided outside of the flange portion in a radial direction with the flange portion being provided between the pair of outside portions. 12. A battery packing configured for use in a vehicle, comprising: a cylinder portion having first and second ends which extends in a direction of an axis, and in which a diameter of a portion in the second end is increased when the packing is fitted to an object, wherein the cylinder portion includes a fold portion which has a tortuous periphery in a cross section orthogonal to the direction of the axis, and wherein the fold portion is formed such that a peripheral length of the fold portion in the cross section orthogonal to the direction of the axis is increased toward the second end of the cylinder portion, and wherein when the packing is fitted to the object, a terminal member for a battery is inserted in the cylinder portion, and a diameter of a portion in the second end in the cylinder portion is increased. 13. The battery packing according to claim 12, wherein the object is a battery housing.