| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to effectively drain water which has permeated into the storage casing of an electronic unit and to unfailingly and easily prevent the electronic unit from failing because of water permeation. SOLUTION: In a drainage structure of an electronic unit box 10 in which an air layer 10a is formed between a storage casing 11 to contain an electronic unit 1 and a box body 12 to contain the storage casing 11, a first drainage 11a is formed in the storage casing 11, and a second drainage 12a in the box body 12. The first drainage 11a is constituted so as to pass through the second drainage 12a. |
