| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fastening member from being loosened.SOLUTION: A battery housing case 11 includes a bottomed square-cylinder case body 31 and a rectangular and flat lid 51. Coating is applied to the case body 31 and the lid 51. In an opposite part 44 (pressure receiving portion) of the case body 31 to a spacer 38 and a contact surface 57 (pressure receiving portion) of the lid 51 with a bearing surface of a bolt B, an undercoat application part 42 is provided. In a portion of the case body 31 different from the pressure receiving portion and a portion of the lid 51 different from the pressure receiving portion, a top coat application part 42 is applied over the undercoat application part 42. Hardness of the undercoat application part 42 is higher than that of the top coat application part 43. |
