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A bus bar to be inserted in a circular through hole provided in a casing and connecting terminals provided inside and outside the casing has a circular section in a portion passing through the through hole. The outer periphery of the circular section is covered with a grommet having a circular secti

A bus bar to be inserted in a circular through hole provided in a casing and connecting terminals provided inside and outside the casing has a circular section in a portion passing through the through hole. The outer periphery of the circular section is covered with a grommet having a circular section, and the ratios of the grommet in vertical and transverse directions are equal to each other. Accordingly, when a bus bar body including the bus bar and the grommet is fitted in the through hole, the grommet has compression ratios equal to each other in the vertical and transverse directions. Consequently, the fitting portions of the bus bar and the grommet uniformly come in close contact with each other, and a sealing property can be fully maintained in the fitting portions of the grommet and the bus bar.

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1. A terminal connecting device for connecting an outer terminal provided outside a casing with an inner terminal provided inside the casing through a conductive bus bar inserted through a circular through hole in a wall surface of said casing, the terminal connecting device comprising: said bus

1. A terminal connecting device for connecting an outer terminal provided outside a casing with an inner terminal provided inside the casing through a conductive bus bar inserted through a circular through hole in a wall surface of said casing, the terminal connecting device comprising: said bus bar having a circular section, at least one end of said bus bar being provided with a flat terminal connecting portion, a grommet formed of an insulating material, the grommet attached to the circular section and including two angle portions, a valley portion being formed between the two angle portions, and an annular slit formed over an inner periphery of said grommet in a position corresponding to said valley portion, wherein the grommet seals along a hole wall of the through hole by pressure. 2. The terminal connecting device according to claim 1, wherein a contact portion of said grommet is formed along an outer peripheral surface of said grommet, and when said bus bar provided with said grommet is to be inserted into the through hole, said contact portion is pressed into sealing contact with the hole wall of the through hole. 3. The terminal connecting device according to claim 1, wherein a part of said grommet that fits in the through hole has a diameter larger than an inner diameter of the through hole. 4. The terminal connecting device according to claim 1, wherein a diameter of said grommet is largest at a part of said grommet that fits in the through hole. 5. The terminal connecting device according to claim 1, wherein said grommet includes a hollow portion, further comprising an adhesive injected into the hollow portion. 6. The terminal connection device according to claim 5, wherein the adhesive is a thermosetting adhesive. 7. The terminal according to claim 1, wherein both ends of said bus bar are provided with a flat terminal connection portion. 8. A terminal connecting device for connecting an outer terminal provided outside a casing with an inner terminal provided inside the casing through a conductive bus bar inserted through a circular through hole in a wall surface of said casing, the terminal connecting device comprising: said bus bar having a circular section, at least one end of said bus bar being provided with a flat terminal connecting portion, a grommet formed of an insulating material, the grommet attached to the circular section and including a hollow portion, and an adhesive injected into the hollow portion, wherein the grommet seals along a hole wall of the through hole by pressure. 9. The terminal connection device according to claim 8, wherein the adhesive is a thermosetting adhesive.