| 摘要 |
A base body includes: a base member (4); a channel (3) provided in the base member (4), the channel having an inner wall surface and flowing a fluid; a fine vacuum hole (1) provided in the inner wall, the fine vacuum hole causing the channel (3) to communicate with the outside of the base member (4) and having an opening; and a slow flow portion (P) disposed at a position close to the opening of the fine vacuum hole (1) in the inner wall surface, the slow flow portion slows a flow of the fluid, wherein at least a portion that configures the fine vacuum hole in the base member is formed of a single member. |
