| 摘要 |
Lock mechanisms are provide between a first case part and a second case part, which are made of synthetic resin and are openable and closable. Projections are formed on an outer side surface of the first case part. Each projection has a stopper hole that extends along the circumferential direction of the outer side surfaces of the case parts. U-shaped deformable pieces are formed integrally with the outer side surface of the second case part. Each deformable piece can be deformed in a direction perpendicular to the outer side surface of the second case part. A hook portion is integrally formed with a distal portion of each deformable piece. Guide portions formed at the edge of the entrance of the stopper hole. The guide portions guide the hook portion toward the stopper hole. Holding portions are formed at the edge of the exit of the stopper hole. The holding portions hold the claw portions of the hook portion.
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