| 摘要 |
The housing kit (90) comprises a housing main body (20) and an aeration member (10). The housing main body (20) has an air passage hole (21). The aeration member (10) has a leg portion (26). The leg portion (26) is a portion that should be engaged in the air passage hole (21). Formed in the housing main body (20) to serve as an internal peripheral surface (23) that defines the air passage hole (21) are, in order from the housing main body (20) external space (24) side to the housing main body (20) internal space (22) side: a first curved surface (23R1), a first straight surface (23S1), a second curved surface (23R2), and a second straight surface (23S2). In a cross-section containing the central axis (O) of the air passage hole (21), the first curved surface (23R1) and the second curved surface (23R2) have curved shapes convex toward the central axis (O). In this cross-section, the first straight surface (23S1) and the second straight surface (23S2) have straight shapes. |
